I'm a bigger guy too at 6'3" and as much as 245lbs geared up. I rode a '08 575 for a while and I could tell it wasn't stout enough for me. I made it work and ran a Fox 36 fork and a 12mm to 10mm stepdown axle in the rear. It made it more solid and I never broke anything. The newer 575s have the chip system rear axle and tapered head tubes.
I made the move to an ASR-7 a year ago and couldn't be happier. It's an amazing bike and fits my body type and riding style a lot better.