$3000 to spend, which bike?

is this how you vent about what happened at SH?  LOL  Enjoy your new toy! 

^^^^^!!!!!!!

Tri bikes vary a lot in geometry so all else is NEVER equal when it comes to fit.  And good fit is EVERYTHING.  As was said, changing stems,etc. too much can alter bike's character (rider's weight distribution/handling/ride,etc.).   And it can cost $$$$ to change out a tri bike's stock base/aerobar set up.

IMHO- Posting a "which bike is better" question on a forum is no way to decide how to spend three large on a new ride.  Any of the bikes mentioned by OP could be a great buy or wasted $$$$ depending on specific rider.

I'll echo the comments about fit.  When I set out to buy my TT/Tri bike, I narrowed down the list and Specialized wasn't on it.  I made an appointment with a very good local fitter.  He tried me on a few bikes and then suggested I try the Specialized Transition.  For various reasons (not important to the story), I was not interested in the Specialized, but as soon as I got on the bike, I knew it was the ride for me.  The frame geometry fit me better than any of the other bikes.  So, I also suggest you go see a good fitter and get her/his opinion on the right frame for you.  And, don't rule out the Specialized Transition.  In my opinion, it's a great, fast, comfortable ride.  

Meh....I think fit is a little overrated....just make sure you get the right SIZE bike. Different manufacturers have different ways of sizing a bike, so a 56 of one type may or may not be the same as a 56 of another....some even use S, M & L...etc.

Just make sure the size is correct so you can get the touch points in the right spot with the least amount of spacers. After that, the bike is almost infinitely adjustable within the realm of sane touch points for you. So you will be able to change your fit within that realm anytime you want. If you get a bike that is too big or too small...you may get stuck in one direction where the bike no longer becomes adjustable.

Having said that....I would go P2 which will leave a few hundred left over.

ETA: All the bikes you mentioned, in the right size, will be able to "fit" you correctly with the right adjustments....

You can make any bike in the right size fit you and, conversely and most importantly, fit your position to any bike.  It's not like you will make the soundest judgment of what's comfortable and powerful your first time riding the bike... it takes a lot of miles to adapt and tweak your position.  

$3000 is a lot of money.  My advice is to budget the money the following way.

$250 for a fit
$500 for a used wireless powertap rear training wheel
$100 for a disc cover on above wheel
$500 for a used deep aero front
$100 for an aero helmet

That leaves you with about $1500.  If you want something brand new, go for something like the Cervelo P1.  If not, you can likely get a used P2 or similar used carbon tri bike for around $1500.

That will be your best bang for your buck.

You need a pre buy fit.

Here is a place that does it either in RI or remotely. For $75-99 you will get recommendations which bike brand, model and sizes will fit you best. I have had 6 bike fits and TTbikefit.com was the last one and was quite impressed with Todd and he made some substantial changes to my position.

Like others have said a good fitter can get most bikes to work with an individual but you don't want to change the way the bike is designed to much by swapping out stems, adding spacers and the like. Best way is to get fit first then buy.

If you look at the parts that come on each bike, Felt and Cervelo I know don't use all same brand/level parts...an ultegra bike is not full ultegra and it is a way to offer a bike at lower price but you get what you pay for. Wheels, brakes, cranks, are often different lower cost brand/models so it brings price in lower. Just be sure you are comparing apples to apples when comparing which brand is best deal. Cervelo brakes wholesale for $4 last time I heard from someone who worked there.

What's this thing you speak of called "fitting"?

I would go with the idea of the above poster....look for a bike around 2k and get good wheels and fitting!!

Within reason? What bikes are you talking about? Can you name two different bikes of similar size that could not be set up to have identical touch points?

The only bike I can remotely think of that *might* fall into that category is the Specialized Shiv. It has very limited cockpit adjustments because of its integrated front end. Other than that, you can fit any bike to any person with identical touch points if the size is correct. To do that, there would not be huge or rather significant compromises made.

If that wasn't the case, how would pro riders switch bike manufacturers/teams every couple years? Are they riding frames that don't *fit*? Of course not....

I don't get what you mean by "compromises", "kind of works", or things going wrong so I can't really respond.  If you mean spacers, then I think that's sort of a dramatic way to describe them.  When I think of "compromises" for bike fits, I think of people who ride a 56 with a billion spacers, when they should really be riding a 51.

As Willie Wonka would say, "Wait a minute, strike that and reverse it...On we go!"