Linksys WRT-350N + DD-WRT firmware is solid and secure. I use three, one as the DHCP server, two as repeater bridges over 3 stories.
The DLink 655 is another great one.
If you don't care about these so-called N speeds, pick up a Linky WRT54GL or 54G V1-V3, throw Tomato on it, get some 7-12dB antennas, and you're gold.