Well with that setup I think the AMD setup is best for you. The 965 would be more than sufficient for those cards but the phenom IIx6 at it's supposed $300 price will also be a good deal with 2 extra cores.
The 955 is also a solid option for $20 less than the 965. At 3.2GHz, the best bang for $$$ AMD has in the high end right now.
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103808&cm_re=phenom_955-_-19-103-808-_-Product
If you get either the 955 or the 965, ensure they are C3 stepping. the 965 125W is C3, while the 140W is not. It's harder to know with the 955 but the one I linked you to is the C3 stepping. C3 stepping is newer and uses a bit less power with more overclocking potential.
If you would like to save some money and keep your current ram, you can use an AM2+ board instead. the x4 and the x6 will both be compatible and there will be little performance hit.
If it were me I would get new DDR3 memory and a board with the 8xx series AMD chipset:
http://www.newegg.com/Product/Product.aspx?Item=N82E16820226101
And in my experience, mushkin is a very reliable brand.
"Oh and would I be as knowledgeable on an ASUS MB as I am on a Gigabyte board? I'm new regardless and no expert but I kinda know my way around the Gig now. "
Not quite sure what you mean by that. If you are asking about the bios, they are generally the same, sometimes with things renamed or put in a different spot but everything is in the motherboard manual so you should be fine.
I like your other specs. Sounds like you're getting yourself a solid system