ok to use pre-N you would have to buy the router and the adapter. This is rather expensive, but the technology, I feel, is excellent. You get more speed at greater distances with less interference. At 200 feet, the pre-n router triples the throughput of all 802.11g routers. At 300 feet, 802.11g signals are not strong enough to maintain a connection, but the pre-n still runs at 30Mbps. THe trade off is that the router/card are kinda expensive. If you already have built in 802.11a/b/g, analyze everything. If you have money to spend and want the fastest/most distance, look at the pre-n/MIMO technology. If you are on a tighter budget, or perhaps, do not need a range of 200-300 feet for your wireless, then a nice dlink/netgear G router should suffice. You should have 30 days to return a router if you buy it from a store, so that can be a nice fallback if you pick up a router and are displeased.
EDIT: czar: you are right, 802.11n was ratified, but specs arent going to be finalized until 2006. My fault