I installed a Zonet PCI card in my father's older PC so he could access the internet across the house. It works great. However, Zonet seems to be really really bad at keeping drivers up to date.
At one point I needed to do a clean format of my father's PC, and I had lost the driver disk for the Wireless NIC. Zonet's sight doesn't seem to have drivers for their products. Luckily I had stashed the disk away in one of my many important software locations, and found it soon after.
I've also heard that they have little to no technical support, but I have never needed to use their technical support system, so I have no first hand experience on that. They definitely have cheap products that work though. The PCI Wireless NIC I bought was $9.99 and works perfectly through several walls.
I'm assuming the USB adapter would work well as well, but make sure you don't get any technical issues.
I probably would buy a Zonet for the price, if I wasn't planning on doing gaming, but if you're going to be doing gaming you may be able to save some money on a PCI card. I'm not big networking person, but I think a PCI NIC might be a bit better on bang to buck than a USB one.
