I can't decide on bikes, advice please.

you couldn't go wrong with either.  I don't think there's a right or wrong answer here.  the 'old' P2 was only ever just marginally 'slower' than the P3.  And, with the front end on the used bike- it's probably currently the faster combination.

that said- if you plan on using this bike for years to come, and eventually want to customize it to your own needs- you couldn't go wrong with the new frame as the basis for any upgrading.  components are easy to change.  

I'd say buy the new P2 for the dealer's asking price, but only if they throw in their full $250 fit session for you.  The fitting will be worth more than any component.  It's time for them, but they get to build a relationship with you, and vice-versa.  Seems like the better deal if the LBS is nearby and you like them.

That's a tough choice.  You're getting good value on the used bike assuming you want everything it comes with.  ISM saddles don't work for everyone, and personally I'm very particular with my Garmin edge computer.  I also use shimano pedals on my other bikes, so some of those add ons wouldn't really provide any value to me.

$2800 is MSRP...any chance that the shop will be having a sale?  I would never pay MSRP for a bike...but this new P2 may sell like hot cakes...so they may not be willing to budge just yet.

While the 2010 is not much different than the 2014, it is still a 4 year old bike.  Not worth $2200 on the used market.  Get the new bike, and you won't be thinking about upgrading in 4 more years.  Just my $.02.  I have a 2008 and love it, but it is time to upgrade @ the 10 year mark.  give yourself more time.  Both are great bikes, but new is new.

Okay so used bike is 4 year old Dura Ace, what is the new bike? The standard saying is that Shimano trickles down technology over time. So a 4 year old Dura Ace may not be far off from a brand new Ultegra. I will say that my 105's are 4 years newer than my Ultegras and I can't tell much of a difference. 

Saddles are very subjective. Do you currently ride an ISM? Is it the same ISM? The tri position is different. You may find you hate that saddle so it is not really an upgrade when you end up replacing it anyway.

The wing is nice, but you can always buy one for $120 I think it is? 

The Zipp bars are intriguing, but will they adjust to fit you? That will be the main issue there. Otherwise sounds like a nice upgrade.

Sounds like the KEO pedals will work fine for you. But they aren't that big a deal, I just got a set for $80 shipped. Pretty cheap as far as bike stuff goes. 

So I guess you have to decide how much the upgrades are worth to you, then you have to decide if the $600 for the newer frame is worth it. That new frame is pretty dead sexy. 

You didn't mention wheels. Are the wheels on the used bike upgraded? That might make a big difference. 

Because whenever anybody sells a bike, it's always low miles, never crashed...no matter what.

What kind of fit did you have? What are your stack and reach measurements on an ideal frame? How do those numbers compare to your options?

I'd go with the new bike for the warranty and the bike support from the shop.

4 year bike is a lot different than a brand new bike.

If you are leaning towards the used bike bring it in and have your shop look it over for you to make sure it is in sound shape. Cracked carbon frame on a bike without a warranty is an expensive repair.

Upgrading parts on bikes is often waste of money unless you need something different to have it fit for you best or something wears out. If you buy a new bike, often shops will allow you to trade out parts for difference in cost. Other shops make you buy new part and now you have two (I will never buy a new bike from a shop like this).

Eh screw it, I'd go with the new frame if I could swing it easily. Newer, looks awesome, faster and has a warranty. I have a riding buddy who has broken 2 Cervelo S2 frames, both replaced easily. 

I agree that price is to high and that $1700 is more in line compared to what is new now.