Any recommendations for a new wireless access point?

My study is at the opposite end of the house from the wireless router. nellorat and supergee are at the same end of the house and have superb connectivity, but I'm at the other end and my reception varies from "low" to "no signal". I just bought a better wireless card and that helped some, but not as much as I'd have liked--I just spent fifteen minutes with no connection at all.

So what I'd like is either a new wireless access point (or combined access point/router) which has:

a) strong signal;
b) 802.11g but backwards compatability to 802.11b so I don't have to buy two more new cards right now; and
c) low cost.

Any recs?