Whilst in no way a commercial grade router, I've been very happy with my two Linksys WRT54G units (one an AP, the other a client bridge) with the DD-WRT firmware on them. Does everything I need and they never need rebooting.
Bought a couple in my previous employer and immediately put DD-WRT on them. Never rebooted them either.
Just make sure you get a hardware version capable of running the full DD-WRT. The WRT54GL will guarantee that.
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Christian
#40104192 120Gb (no longer in my E36 M3, won't fit the E46 M3)