I can't comment on the price as I have no idea what the market in North America is like, and the wild fluctuations and weakness of the GBP mean that prices could be way off on opposite sides of the Atlantic.
You've been around on here for long enough to know that the 3x8 engine is rock solid and has bulletproof reliability if it's properly maintained, and should be good for 150K miles. As always with Italian cars, the electrics are the problem areas, and a 25 year old car is bound to have a few problems with the original wiring getting hot and shorting out eventually. I've had a couple of minor electrical problems on the 308. The first was when the relay fuse for the electric windows blew and the second was when a couple of the extensions for the plug leads shorted. Both problems were very inexpensive to resolve, and so far I have had no other issues with the 308.
In the end I chose a 308 QV over a 308 carb model for several reasons. Firstly because it was the first 308 which was fully galvanized, and in my climate (and no doubt yours too) that is important. Secondly, I couldn't be bothered with messing around with carbs trying to get them set up and forever tweaking them. Fuel injection is the best option for me as I'm not that mechanically minded. The third thing that made me choose a QV was that it was the 3rd incarnation of the 308 and theoretically, the most refined and trouble free model.
Having been a prior 1989/1990 328 GTS owner, the 308 does feel a little bit dated next to the 328. I love both cars for very different reasons, the main differences are as follows:
328 has more power - 270 BHP to 240 BHP, not a lot of difference, but the 328 had much more low down power, with the 308 it only really kicks in after 3K RPM, so you have to really work the engine to maximise your acceleration. Although the 308 has plenty of mid range overtaking power and enough torque to pull away at low revs in 4th or 5th gear.
The 308's never going to beat an Imprezza between the lights, but if you're not bothered about that, it has enough power.
The 328 was fitted with ABS, I don't know how much difference this makes as I never got to use it, but I have locked the wheels of the 308 a couple of times. It's worth remembering that the brakes on a 25 year old supercar won't be as good as the brakes on a modern hatchback.
The 308 has lovely 70's switchgear and levers on the centre console. The 328 has stock Fiat parts which are not nice (I've noticed they use the same or similar switches on TR's and even F40's).
The 308 does feel very raw compared to the 328, the 328 was the last evolution of the beautiful shape and was naturally the best equipped. Although, the 308 has everything the 328 had except ABS and the 3.2 engine.
The 308 is noisier, but that is down to my Larini sports exhaust which barks and growls.
I think the cabin of the 328 is more claustrophobic than the 308's. I'm just over 6 foot tall, weigh approx 165 Lbs and have a 40 inch chest. I always felt cramped in the 328, but don't in the 308. A word of warning, the seat backs are very narrow, and whilst someone larger than me could fit in them, it would be uncomfortable on a long journey.
I love my 308, and loved my 328 too, it's hard to say which one I prefer, but if I really had to chose, it would be the 328, but only for the extra 30 horsepower and low down power from the 3.2 engine.
I hope this has helped you a bit. If a 308 is what you really want, go for it, take a test drive and see how it feels. As long as you accept it is a 25 yr old car and won't have the pace of a modern mid range Japanese sports car you won't be disappointed.
Keep us all posted