Cooler - The Zalman 9700 is alright, but you'll have to buy that $9 bracket I linked, to mount it on the 1366 socket.
Case - Personally, I've no experience with NZXT, but I checked out the specs & they looked alright to me. Maybe somebody else who's used one of those can guide you better. However, it costs a whopping $120 incl. shipping. That's a whole lotta dough to shell out for a mid-tower though.
So if you don't have that case already, for $10 extra (incl shipping), you might wanna look at $130 - COOLER MASTER HAF 932 ATX Full Tower
Or, save some money & go with the Mid-Tower younger sibling - COOLER MASTER HAF 922
- $90 + $10 shipping.
Now for the Mobo - The only reason to get the Rampage formula over the Sabertooth/Gene is if you want Tri-SLI. Otherwise, really, the killer looks notwithstanding, it doesn't make much sense to look beyond the Sabertooth. If you want your build to look bada$$, the Gene is a definite option.
In any case, the Formula will downgrade 1600 Mhz RAM to 1333 without OC. The specs definitely are pretty good, but almost identical to the Sabertooth/Gene. It ain't worth the extra $100/$60 IMO. YMMV.