I would suggest the AudioTrak low profile PCI sound card. It comes with the bracket - unlike most cards - and is based off of the Via ENVY 24PT chipset. 100SB S/N Ratio.
I was considering the SB Live card - and technically it is a slightly better card for slightly cheaper money, but they don't include the damn bracket. Also there is no industry standard optical out (just an expensive propriatary Creative labs jack that requires a pricey adapter).
See my post about low profile cards.