The SSD performance may be that much better than HDD but you haven't addressed the most obvious problem with SSD. 40GB is even less than 64GB and neither is large enough to fit Windows 7 and a library of games. Windows 7 itself takes up 16GB which leaves 48GB/24GB. Most modern games easily use 2-5GB, you might fit a few games but if you plan on buying games in the future you'll run out of space and be forced to uninstall things to make room. I've already used 117GB on my week-old new build and that is only Windows 7, games, and apps (all my music/movies/video/pictures/etc is stored on my 1.5TB server). If you have hundreds of extra dollars to spare on your new build, go with a 128GB SSD, that way you'll have room and speed, but I honestly don't think SSD's are worth it yet. The technology is great, but the cost per GB isn't good enough to make it worth buying yet, especially when the price will probably drop as mainstream SSD use increases.
As for the motherboard, I would go with the Gigabyte X58A-UD3R instead of the one you picked. They're both $209 but the Gigabyte is a full ATX board (more expansion slots, more features) and the Gigabyte supports USB 3.0, SATA III, and has a lot more ports on the rear panel (8 USB, 2 eSATA, PS/2 keyboard AND mouse, optical/coaxial SPDIF, 6 audio, 2 firewire, gigabit Ethernet, and clear CMOS button). I'd only get the Rampage II (or any MicroATX board for that matter) if you're using a microATX case. The case you mentioned in the first post is an ATX Full tower, which is plenty big enough for a full size ATX board.
Newegg.com - GIGABYTE GA-X58A-UD3R LGA 1366 Intel X58 SATA 6Gb/s USB 3.0 ATX Intel Motherboard
Also that RAM will work, it is triple channel DDR3 which is perfect for the Core i7.
