You guys are giving me a wide variety of options. Let's see now. On purchasing a 152 I thought that they were more expensive than that! As far as applying to a regional don't they require multiengine time? (How much fuel in todays market are we talking about too get to the 250hr mark?)
Spend some time on
www.trade-a-plane.com and you'll see.
Straight up, clean, low-time SMOH 150s are around $28K - $35K for the REALLY clean ones and nicely-equipped. 152s are going to be just a shade more. If you can find one IFR-certified, even better, but it WILL cost a little more. Call it maybe $30-38K range, again, depending on hours on the plane and condition, etc. New paint and interior will cost more.
For example....this is just one of many....
http://www.trade-a-plane.com/classified/search?browse=single&usealttemplate=1&adnum=792216
I've been doing a lot of research on this. Although there are OTHER airplanes that I like better, for a training, time-building airplane, the C150/152 is a good way to go, IMHO. Relatively easy to fly (only thing I fly, but others tell me it's easy) with forgiving handling characteristics, economical fuel burn, built like tanks in terms of abuse they'll take, and relatively simple motors and systems.
Downside as I see it: low payload. You and your CFI better not mind rubbing shoulders and both of you better weigh less than 200 lbs each. Also kinda slow. 95kts looks good doing primary training, but I'm already wanting to fly faster airplanes.
If that's an issue, step up to a 4-seater, perhaps. More money, maybe - IFR-certified 172s seem to be going around $40k-$50K, again, depending on equipment. VFR-only will be less.
Keep in mind, though - once you sell the plane, if you take care of it, you're going to re-coup a LARGE part of your investment - as long as they're in good shape and the motor is in good shape and not about to cross into MOH time, they retain value well.
And that money you get back, you put into the advanced ratings.
It's an awesome plan if you can swing it. It's the way I WISH I could be doing it.