i have a Dlink and i've NEVER had problems with it. my computer is constantly on as well. the most time it's spent off in the past year and a half is when swapping parts or installing new ones. i ran 76 days without rebooting (gotta love linux, til i got XP) and never a problem with the modem (Toshiba) or router.

www.pricewatch.com

that's where i found a lot of my computer parts. i got my router for $36 shipped to my door. gotta do some hunting on there, but it's very worth the time and effort.