I'll actually agree with Synchromesh on the Audi A4.
And even the MAINTENANCE
(not the repairs that are called maintenance) is expensive.
Anyway, by wanting big... do you mean, you want something with lots of room for you, or do you just want something large?
Also, what are your goals with this car? Fast in a straight line? Good handling? Some combination of the above? Sleeper?
If you want a big sleeper, GM's got some nice stuff hiding in Buick.
Regal GS... 3.8 V6 supercharged, and it MOVES. And, best part is, it's a Buick Regal, so everyone thinks you're some old fart.
96 (IIRC) Roadmaster Wagon... hiding an LT1 under the hood. From the factory. Hauls ass... while hauling eight asses.
That's just some stuff I thought of off the top of my head. Say more of what you want, and I can give more suggestions.