I'd like to go with my IRL car, a 2009 Subaru Impreza 2.5i sedan. But if the current body style Impreza NON-turbo doesn't make it into the game, which would be a shame, I'd like one of my other IRL cars that might be in GT5..
--1980 Datsun Nissan 200sx ...or something close, what was that named in Japan?
--1986 Dodge Charger Shelby 2.2L turbo ....or similar, not holding breath on that one, fun as hell car though!
--1986 VW Golf 1.8L ...great little car
--1985 Honda Prelude 2.0si ...probably won't be in there :-( -but the Accords of that time period are somewhat similar in GT
--2001 Subaru Legacy GT ...doesn't really count, mostly my X-wife drove that, then smashed it in drug induced haze.. that beee-och- I left her shortly after that.
Ironically, if it weren't for all the years playing through GT1, 2, 3, 4, and 5p, I probably wouldn't have purchased a Subaru for my first and only brand new car. Since the early GT series I always loved the Subbies.. Couldn't afford a brand new WRX just yet though IRL. Maybe someday.
Other than that, I'm getting licences first, but like people mentioned they will do earlier, I might get slower cars on purpose so the races are harder and more challenging. Yes I wrote all that, I have a cold and headache and can't sleep. :-/