Thanks again guys -- I ended up buying a Stihl FSE-60 corded model -- very nice weight balance and power. It's a more robust feeling/looking unit:
(click on image for link)
You have to buy these from a Stihl dealer, and they have to assemble them for you. I got mine from a locally owned hardware strore called Robinsons Hardware, and I'm good with that...
I swear that this trimmer is virtually the same unit as the Troy-Bilt TB 50 unit Consumer Reports recommended in their May 2006 issue, which is the most recent review they have done.
Ya' gotta' manage your cord, but it won't run out of power, and it is more efficient than using a battery. There is a very effective "hook" on the back so the cord will not unplug, and I paid $3 for a clip that locks two cords together, too. It isn't cheap ($120), but I think it will last long enough to make it worthwhile.