The rampage II extreme is far superior than the evga x58. It's the best board out there right now.
The EVGA X58 and the Intel Smackover are at the bottom of the food chain..
If you wanna save, Even the cheapest Asus P6T outpreforms the EVGA.
Don't pay extra for the EVGA when you can get better for a lower price.
If you want good proof of what people have done with their boards then read through this thread: fitseries3/dark2099 Core i7 Overclocking and Feedback
There's a lot of boards people are using. Personally I'm going to keep my RIIE because it's actually in perfect working condition, but if the classified was out earlier I would have gone for that instead.
Word of warning about the EVGA x58 is that the mosfets seem to get exceptionally hot.