Changing the mobo changes a lot
i would suggest you look into MSI and DFI as makes for motherboards but the board you've picked there is also very nice. just note however that you are paying a premium for ahving a sli board there (the ASUS on you picked)... if you dont forsee youself running in sli mode then dont bother with the additional expense of the sli board and just get a board based on the nForce4ultra chipset (what is sli?
answer). if you want a product reccmendation, id suggest the
MSI K8n neo4 platinum or
DFI lanparty ut nf4ultra-d
the new RAM you've picked out is very nice and tailored for gaming environments... again do realize it may be overkill dependig on what you're looking to do
according to
the manual the CoolerMaster PSU there is packing 12v@19a... which is just above what i would consider absolute bare minimum (18a)... have a look at
PSU 101 for some suggestions... there are some decent PSUs you can get for not all that much.