I have that asrock mobo and it works great. Bought mine for around 60$ on newegg. Great if you want expansion capabilities and it seems that you are not the type, nor have the budget to go all-out (need 2 pci-e slots for sli)
Oh and also, I really think you should have just bought a barebones or something for 400$. Because of the older mobo, you are strictly limited to a few options.