go rigid - im running a 2.4" front tire inflated to 35psi... not any rougher than my old bike with front suspension fork (albeit it was on 1.85")

if you dont like it, you can always swap in a suspension fork

the eno is unecessary--if you have the money: go for it. otherwise, its overrated. im using a 15$ shimano freewheel... blissfully quiet, smooth, and hasnt seized or exploded on me like eno fans would so often argue. also is overrated is carbon. you tell me how a seatpost made of carbon instead of aluminum is going to help absorb bumps... especially when you're running into babyhead rocks and going off drops. its all marketing which 95% of the market falls prey for

so there you have it: rigid and fat tires.

have fun with your bianchi