Wheel setup question

I am building a new TT/Tri bike for the 06 season and had a question about wheels. I am on somewhat of a limited budget now since we just found out my wife is pregnant. Now comes the real responsibility.

I own a few sets of wheels that I was just going to run on the TT bike until next year when I can probably buy a disc and maybe an aero front. I have Ksyriums, Neuvation M28's, Rolf Vector Pros and some junk Alex wheels that came with my road bike. I am running 10 sprint tri's this year, with the courses being 50/50 flat/rolling terrain. I am a top 10% agegrouper. The TT's I ride in are a few local courses and are 90/10 flat/rolling. Now, I have had some people tell me to just find a super deep rear wheel and run the Rolf up front this year. They say it's close to the disc aero wise and isn't that much of a difference for the cost(I'm looking at a used Stinger for <200 vs a used disc for 350+). They can't really back up their claims though except talking about the deep wheel being lighter for climbs than a disc.

So, my question is, would running a 90mm deep rear and a Rolf Vector be anywhere close to a Disc and a Rolf Vector? Factor in cost of ~200 vs ~400.

Thanks for your time.