kinda depends on several factors. what are you going to use it for? can't speak for the 6, but the 4 does fine for me. i use it around town and for going to work(16 mi away) i don't depend on it as my only vehicle and if i need room, speed or confort i have 2 other vehicles to choose from. i'm far from being a kid anymore so accelration and top end aren't that important to me-just wanted something to get me from point a to point b and is fun to drive and is fairly good on gas(tons better than my PU) had it little over a yr now with min problems and got me through last winter and all the snow we had(had a 80 mi round trip to work then) alot better than most.
would i like a 6-probably, but wasn't really a concern at the time i bought it. being clean, no rust and from what i could tell, semi well maintained at a fair price was. as for resale, being 100% stock, don't see much problems there as that seems to be what alot of ppl want so they can mod it themselves the way they want it. checked out quite a few b4 i bought (stock and not so stock) and think i picked the best for the price.