Well, if fisty's bad idea doesn't work for you..
I've become a surprisingly big fan of Black and Decker's lawn stuff. I'm still afraid of their cordless gear, but all of their plug-in electric stuff that I have (mower, blower, hedge trimmer) has been good stuff. Not good enough to run a lawn service, but plenty of power for home use and no breakdowns at all over a number of years.
For gas, watch the timber games on ESPN The Ocho, and buy those brands. Stihl, Husqvarna, etc. I am consistently underwhelmed by Poulan. I think they must have been sold or something because their equipment was pretty good when I bought a mower about ten years ago, but I don't see the same quality today.
I have a Craftsman Weed Whacker that is going on 20. It's pretty beat up, but it hasn't quit yet. It does have a tendency to recoil inside the casing for some reason. It seems to be a common problem with electrics. The motor will twist inside the case and pull the wiring loose. It's not difficult to fix, but it is damned annoying when you're trying to get the lawn done on a weeknight before the sun goes down.