Hi there,
I've used a lot of Gigabyte motherboards and they have all been really solid and performed well. Personally I would probably go for one of the 8 series motherboards and this one in particular caught my eye when looking for you:
http://www.gigabyte.com/products/product-page.aspx?pid=3635&dl=1# the GA-880GM-UD2H.
The main reasons I would go for this particular board are: the better on-board graphics, better sound chip, up to 16 Gig of RAM if you want to expand in the future and most importantly, it will support your chosen CPU out of the box. The GA-MA78LMT-S2 will almost certainly need the BIOS updated before you would be able to run with the AMD Phenom ii 840 processor.