It would be a tough decision and I agree, moding out the RS4 would be the way to go. Supercharger, chip, exhaust=wax 'em all! If you did those mods just right, you could end up w/ 0-60 times in the low 3's...yikes!
I am 6'3 and a bigger car isn't necessarily a bad thing. I love my RS4 and have no intention on trading/selling it anytime soon FYI. It was more of a hypothetical response to an array of new RS/R info.

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I hear you. If you're 6' 3 I don't blame you. Being just under 6' the RS4 is just about comfortable. If I grew even a half inch I'd be hard pressed to feel comfortable. Good thing you only get shorter with age

 

The new RS6 should have the v10 and here is a pic of what it should look like! Freakin badass if you ask me!

 

Damn, that RS6 is THE car to have. If I was an RS4 owner I wouldn't bother with a whole lot of modding to keep pace. For one, how much boost do you think you're gonna run on 12.5:1 compression?! You pay 25 grand for an MTM blower, god knows how much for someone to tear down the FSI 4.2 and throw in low compression pistons & whatnot and by the time all is said and done, you end up with a car that may or may not be much faster than a yet-to-be-built RS6 and definitely far less reliable. For me, it's V10 or bust.

 

RS6 all the way

 

Lets see Audi try something new - quad turbo

jokes aside dont expect any biturbo jobs on any of the performance stuff from Audi in the near future - it will all be N/A free revving engines unfortunatly[]

 

yeah i wouldnt be surprised either, but being Audi the enignes will be great.

Quad turbos on the 5.2 V10, insanity at its highest

 

Merc has the tri turbo diesel V8 doesnt it

 

The only reason the M5 is so rediculous in acceleration is because of the 7-speed transmission, shorter gearing = more acceleration. I wouldn't be suprised if Audi makes a 7-speed as well. As far as power goes, naturally aspirated with 100 hp/liter is a no brainer, I highly doubt twin-turbo. So expect around 520 hp or more NA with lots more torque.