I don't think that CMOS battery would/could interfere with your SATA card. It's profile is well below that of the PCI slot. I'd be a little more worried about the NB fan cable and connector interfering with the first PCI slot.
EDIT: Ah, didn't catch the fact that the card(s) have the longer connector.
And I agree that the cheaper hardware is definitely a good move. There's really no need to go for server-grade hardware here.
EDIT: Ah, didn't catch the fact that the card(s) have the longer connector.
And I agree that the cheaper hardware is definitely a good move. There's really no need to go for server-grade hardware here.