I wouldn't turn down the hennessey, but I'd prolly put it up for sale. Driven a few vipers, they're a tad on the rough side with severe balance issues. I mean, a 360 challenge stradale is more comfortable inside. Although I like how they look if I was gonna go American, I'd spend hte extra dough on a GT. :-)
I love my A6. Fast, smooth, plenty of power for the everyday driving etc. Surely not the fastest on the road, but it still holds its own very nicely. It has timeless styling and still looks modern. I get plenty of compliments and respect, but the best part is unequalled reliability when it comes to the AUDI line-up of motors. Properly maintained, I expect my A6 to last to 200,000 without problems. Let's see the turbo and supercharged cars do that. Fastest car I've ever owned was my 1970 Datsun 240Z with around 20k in mods. Speed, HP, and competition is individual taste. I've seen 240's eat up the high end performance cars and then watch their owners cry when they break. I always drove home from the track. It is what it is = pointless argument. There will always be something faster. The MODS don't exist for the A6. Prolly never will. Fine by me. If I want a faster car I will go buy one.
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2001 Audi A6 4.2 Sport - Silver 2004 Lexus IS 300 SD - Black