One thing to consider.. if you have DSL you may have wireless built into the modem. I bought some stuff for my father in law... at the time he had three desktops and didn't want to run wires just so his new step-kids could browse the internet.
I purchased a cheap D-link wireless router and two el-cheapo chinese PCI wireless cards (his computer was going to be hard wired).. as you can tell he was on a tight budget.
He finally got DSL all set up and all that so I went over to his house and low-and-behold I saw a SSID and encryption code printed on the housing of his DSL modem. Plugged that information into the wireless cards and voila! Everything works. I took his D-link router as payment for my services and am still using it today.
Is it a GOOD wireless router? Probably not, but it seems to be holding up pretty well (been using it almost 3 years now)... I get a good lag-free connection to AH and only see two or three discos a month, of which I'm not even sure is due to the wireless connection. But also keep in mind the router is less than 10 feet away from my computer.. it's just on the other side of the floor (in the basement).
As far as configuration options on the DSL wireless modem... well they are very limited. You cannot change the SSID or the encryption code, but it does auto assign IP's and all that.. I just don't know how secure it is... but if you're not worried about that sort of thing...
Anyways.. might be something worth looking at, if it applies to your situation.