This is my list of what I would have in my garage if I had the money and space. Some are well under your price range so I'd put after market options on them as needed to spend the money. They are not in any particular order:
1. Infiniti FX45
2. Jaguar X-Type
3. Infiniti G35 (not sure coupe or sedan)
4. Mustang SVT Cobra convertible
5. Jeep Wrangler Rubicon
6. 50th Anniversary Corvette
That new Audi S4 V8 that will be out this fall, or maybe the new CTS Vseries - they are both high on my list... and if that mythical little Lexus IS430 ever makes an appearance, I am going to have a tiny little 4 door in my garage with a big honkin V8 under the hood IMMEDIATELY... those are definitely my top 3, all others are far down the list frm them! And if they make the new Pontiac GTO in a 4 door, it would be on my list as well...
But as far as RIGHT NOW goes, The Audi A6 4.2 is pretty nice and would be on my list as would a used M5, an E500, a Lexus GS430 or a Q45...
I know whatever I pick, it's gonna be an all-wheel-drive or rear-wheel-drive V8 4 door, thats definitely my next car.