I don't mind paying $40 a month for good service like this. :3
My router is a WRT54GL v1.1 running DD-WRT standard-generic v24-SP2, overclocked from 200MHz (stock) to 240MHz (safe), and Wi-Fi boosted signal output from 71dB (stock) up to 100dB (safe). Broadcasting on Channel 8, since channels 1, 6, and 11 are saturated in my neighborhood.
I used this sweet little web app to show the channel saturation around me:
http://tools.meraki.com/stumbler
RAM sinks were added to the 3 chips inside to help dissipate excess heat, and seem to be working flawlessly. I'll eventually replace this router with a WNDR4500 from Netgear, but for now I'm quite impressed with what I've managed to squeeze out of suck a cheap little $7 second-hand router from Goodwill. Any time I come across a GL or a GS, I buy them right away, flash them to DD-WRT, and usually give them to friends in need. I also keep one in my portable "PC Repair Toolkit" for connectivity troubleshooting on-site.
Additionally, if you have any questions about DD-WRT, Linksys (Cisco) routers, or router flashing, don't be afraid to ask.