I've got roughly 45mb via Wireless, I have an Apple Time Capsule, so I can backup/store files, but the best thing is that it is dual-band, so it can be on a 2.4ghz frequency for phones, older laptops, playstation/xbox, and also running simultaneously on 5ghz on Wireless N.
Then again this is quite costly, but for me it's just all in one so worth the price for me. Best thing would be to get a Wireless N 5ghz router, and just setup the older one for G as well, that way it shouldn't interfere and you can get the fastest speed possible.
Actually a quick google for a sim dual-band router brung up a Linksys one for under £50. Decent price, not sure how good that is though.
http://www.lambda-tek.com/components...prodID=B100126
But yeah, dual-band is deffo the way forward.