...but...but... a $15 wireless router/repeater from WallyWorld is SUCH a bargain. < /sarc>
I tell folks to try and get the refurbished linksys e2000. They are 29 refurbished. It’s important to flash ddwrt because it’s a piece of crap on its own in stock form.
Some great advice above, especially about bridged mode. I tell my clients to avoid ISP supplied equipment as much as possible. Comcast gateways are total crap. DSL customers are often out of luck without bridged mode and it can be a real pain to set up and even more so if you have to reset it.
If you have the cash and don’t want to mess with open source solutions, Asus makes great routers with tons of features. They are pricey though.