Wireless design

I have a c-lab in which I have very few cat-5 drops left and need to put in more computers. I am thinking wireless for six of the computers. My lab area distance is 30 to 50 feet max. The computers are Gateway 1.8ghz, 256ram. I am looking at theD-link air DWL-520 wireless PCI adapters w/DWL-1000AP wireless access point 802.11B. I maintain a lab in a city municipal library and cost is always a concideration. Is this a viable way to go or is there other options that would be good or better.

The other option I had thought about is a hub with NAT abilities. Thanks in advance, Randy