Wireless router...?

It died after one year of use? That has got to suck .
Before pronouncing it dead, did you at least attempt to upgrade the firmware? If you did, read on I suppose.

Not sure what you mean by business class routers, maybe you mean this? They are terribly expensive and I'm not sure you know how to configure cisco routers. And no, I'm not going to be your personal tech support for it =p.

What I think you need is a proven rock solid router. I'm sure others might disagree with me but I recommend nabbing a Linksys WRT54GL router. Like you, I've got everything but the kitchen sink using bandwidth through a router, that includes my little ftp setups. So far it hasn't died on me at all for the past three or four years. Well I take that back, when I first bought it the original firmware was causing problems (dropping connections during large file transfers) but a firmware upgrade quickly fixed that. In short it will probably be the only router you'll ever need.

Again I'm not quite sure why you need a business-level wireless router. Maybe you left out something?

Jam it back in, in the dark.