wireless-G 802.11b/g

i have three computers thats using 'Gigafast wireless 802.11b/g 2.4Gh ' receivers, and one is using wired, all connected to a 'Gigafast wireless Router' but i want to switch to a better router becuase the Gigafast router overheats too much and always disconnects.
any suggestions which brand and which one i should get since i have so many computers, and that i still can use the Gigafast receivers on the router?
thank you