Darren,
Oh yeah, I kind of like 308's but don't get me wrong, I'm a fan of virtually every Ferrari. I like the 308s because they're tough, drop dead gorgeous, absolutely a blast to drive and even comfortable; I'm 6' 1."
$85K for a 308 is out of control. I don't care what kind of shape it's in. You can get a damn nice TR for $85K nowadays. A very nice 308GTB/GTS shouldn't go much past $30K maybe and a very big maybe, $33-35K. Now, the FI'd 308's (i.e. a 308GTSi/GTBi) should be cheaper due to the loss in bhp (about 50-60 from the GTB/GTS's) because of emissions and of course, the fuel injection. However, I've read that they are a bit more reliable because of the FI. In my opinion, it's all in how the car was taken care of from day one. Nice QV's are in the $30K-37K range whereas 328's can go as high as $40-45K.
As far as mileage... Any car should have service documentation with it. I've always been wary of very, very low mileage cars. These cars haven't been driven and hoses and belts will dry rot over time. My car has 26K miles on it and has documentation. This was one requirement I set as I started looking. Same goes for high mile cars. When was the last major service done? Believe it or not, a car with even 100K miles on it may be more desirable than one with less than 10K. My little car LOVES to be driven on the open road. It just isn't as happy in town! 308's are very user friendly. Comfortable, not heavy, good visibility, decent gas mileage and of course, great looking. On the other hand, TR's are heavier, more difficult to drive in town and of course, 12 cylinders at 5.0L! Don't get me wrong, 12 cylinders rock (just ask Bart, he LOVES his 550 and drives it frequently).
I, too, had a Corvette (a '95) and it was a nice car but not a great car. It was a pain in the a$$ to get in and out of but had a great engine. Straight line speed from 0-60, hands down the 'Vette but as far pure driving pleasure, my 308. No doubt about it. Edward Gault just bought a Corvette and still has his 308. He'd be good to ask for a comparison as well.
I compare my little car to my two stroke Tony Kart I used to race (and fix... :-? ). Both are low to the ground, turn on a dime, stiff, lack power steering and a blast a drive. BTW, are you looking for a daily driver??
Just buy a Ferrari. Forget everything else. You won't regret it. If you're not satisfied, I'll take the car off your hands.
Forza Ferrari,
Dane