Im looking to build a new system with the lastest Ubuntu. I will be using mostly for watching video, cruising the web, maybe video editing if Im motivated. this is what I have so far...

I keep going back and forth on the CPU and the motherboard.

Case:
Rosewill R102-P-BK 120mm Fan MicroATX Mid Tower Computer Case - Retail ($25)

Memory:
CORSAIR 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory - Retail $50

Hardrive:
(2) Western Digital Caviar Black WD1001FALS 1TB 7200 RPM 32MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drives - OEM ($100 Each)

PowerSupply:
CORSAIR CMPSU-400CX 400W ATX12V V2.2 80 PLUS Certified - Retail - OEM ($60)

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I really like this MB but what CPU would you use with it?

MotherBoard:
GIGABYTE GA-MA74GM-S2 AM2+/AM2 AMD 740G Micro ATX AMD Motherboard - Retail $55