I am looking to get a USB 2.0 PCI Card or a USB/Firewire mix. My question is "Are there different performance levels from one USB 2.0 Card to another?". I see 5-port cards at different prices. Is there really a difference or can I just buy the cheapest one I can find. I would like to get a 3-port USB 2.0 with a 2-port Firewire but they are a little pricey. This card is going into my XP Home system. I've got a Dell Dimension XPS B800r system.