I can whole heartedly recommend the Linksys WRT54GL. its an excellent router. it never drops connection, has oodles of features even from the factory, and is expanded 10 fold with the custom hyperwrt thibor firmware.
I have 2 macs, 2 pc laptops, a desktop, PS3, Wii, and xbox 360 hooked up to it at all times, absoltely no problems ever. I get phenomenal speed and strength everywhere in my house. this is however on the GL model, i have heard less than stellar reliability stories on the standard model. the GL runs Linux.
i myself purchased the Airport Extreme Base Station, the GigE version. it was a great router also, but its so pricey its just not worth it unless you want to run 802.11n all the time.
Thats actually one of the reasons i bought it, but i didnt find out i couldnt configure it how i wanted until i got it home. i wanted a A/G/N setup, but you cant do that. you can only select A/N or B/G/N.
if you want a router that will give you ZERO headache, and not even dent your wallet, get thte WRT54GL!