Brand wise, you're going to get what you pay for. All the cheaper companies have upped their game do to their experience in the industry though.. i.e. dlink, linksys, smc, etc...
Make sure you go for 802.11g not b as g runs at about 6 times the speed of b. The linksys 802.11g router is not much more expensive than the B either. Remember to get 802.11 g nic cards as well so that you can take advantage of the higher speed. Even better, 802.11g is backwards compatible so it works with 802.11b nic cards as well. Happy shopping