For $10 you can get a PCIe aka PCI Extreme. Good price for a PCIe card. You get a 4 port at NewEgg for around $23 shipped. Here locally they're selling for around $60 to 70, so $10 shipped is pretty good.
Well first off since we're poor cheap bastards I was running with that.
That card only has 2 ports, and do you have the need for the extra speed. Here's a linky I found that explains the current situation pretty well. It seems that currently the bottleneck in the real world may be the SATA to USB controller.
Soon 3.0 will be up to par price-wise. Unless you have the drives and the need for the speed it's a pissing match, which is always important to win.