What're their reputations...?

I have a KH 20" that I’m getting better and better on each day, but I want to do more distance than 20" will allow comfortably. I’m looking around and I’m stymied about all the companies and their quality. Can anyone give me a quick rundown on the quality and reputations of Torker and Nimbus and Semcycle and KH and Pashley and the rest? What’s generally good, what will wear out and/or break quickly, what should be avoided at all costs? The next uni I buy will have to last me a long, long time. I don’t want to misstep in my purchase. Suggestions?

the bedford XC 29er is good and a great price too.