I have almost that exact system as my main home work station except 16GB of ram which is excessive...I have a hard time going over 8GB..it is a pretty good processor but its new so doesn't work like it really should with some stuff, performs the same as the old quad cores with a lot of software, if your using Linux its fine though. Just make sure you flash your bios to latest or you will run into some weird problems. I actually had a game that wouldn't work untill a flashed the bios believe it or not.
To be honest I would not consider doing this build again, I upgraded from only the previous generation and honestly its not that much better...but If you have a pretty old computer its definitly worth...The main thing that setup needs is an SSD, you will see a dramatic difference in performance with an SSD. Also definitely get 2 extra monitors and make use of the eye infinity.
A few other comments: Consider 6.0GBS SATA drive instead, Consider getting the MSI HAWK Radeon 5770, they come overclocked out of the box and are fast enough to run any game at max settings with huge resolution (I have lots of games and I have bought 4 of these cards now its probably the best card I have owned, it benchmarks at the same speed as the newer ati cards and is slightly cheaper)
It reallly depends what you plan on doing exactly but for day to day typical stuff this whole build is completly overkill, If your not editing massive videos or working at a science lab or something very out of the ordinary then just get a Phenom II or i6 and 8GB of ram with an SSD instead, they are really just as fast as this new shit for normal everyday computer uses including playing games, but then again I guees you could say your prepared for the future....Personally I should of just stuck with my phenom II x4 945 and 8GB of ram because I can't even tell a difference really and I am a sysadmin, programmer, and do edit and encode very large movies.
The best upgrade right now is an SSD drive by far, an SSD raid array even better. You will be blown away, you will not go back to normal hard drives except for storage. Hard Disks are the biggest bottleneck currently.
Another thing if you buy this board and plan to use all 4 RAM slots just get the DDR3 1600, don't waste your money on the higher clock speeds because its not supported on this board if you use all 4 banks.
I can't even use 1 full core on average and never go over 8GB:
load average: 0.71, 0.79, 0.80
Tasks: 186 total, 3 running, 182 sleeping, 0 stopped, 1 zombie
Cpu0 : 3.0%us, 5.3%sy, 0.0%ni, 91.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu1 : 3.9%us, 7.6%sy, 0.0%ni, 88.5%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu2 : 0.7%us, 2.0%sy, 0.0%ni, 97.4%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu3 : 2.7%us, 4.7%sy, 0.0%ni, 92.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu4 : 4.3%us, 5.4%sy, 0.0%ni, 90.3%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu5 : 2.0%us, 5.0%sy, 0.0%ni, 93.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu6 : 0.3%us, 0.7%sy, 0.0%ni, 99.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu7 : 0.3%us, 1.3%sy, 0.0%ni, 98.3%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 16417164k total, 6815692k used, 9601472k free, 282508k buffers
Swap: 265068k total, 0k used, 265068k free, 4210204k cached