I've just placed an order on NCIX and I've saved up around 300$ CAN, at least, as for the video card, don't take the "EVGA 8800GTS 320MB" if you need video capture and all, take an all-in-wonder or something like it.
As for an AMD motherboard/CPU, you'll need a fast CPU, maybe you're better with Intel, as I heard they are good for multi-tasking. As for myself, I just bought the AMD X2 6000+, cost me around 210-250$ CAD, I want something fast, and I trust AMD. (I don't game more than that, I'm a web-designer)
Here is a good AMD motherboard, but if you don't care for the noise, I suggest you buy something with a fan on the chipset. (It's the Gigabyte GA-M57SLI-S4)
NCIX.com - Buy Gigabyte GA-M57SLI-S4 ATX AM2 NF570 SLI 2PCI-E16 2PCI SATA2 RAID 1394 Sound GBLAN Motherboard - GA-M57SLI-S4 In Canada.
Can be priced match to something like ~105$ CAD. NCIX are good for price matching usually, and the shipping is reasonable, not like TigerDirect.
Well if you got any other question, don't hesitate.