Right now I'm using a Singer Inspiration 4210 and just received a second-hand Singer ProFinish 14CG744 overlock/serger as a belated birthday/Christmas present. If you're a serious sewer, you know the magic of a serger.
The Inspiration is a really sort of basic machine, and gets the job done, but the tension can be REALLY temperamental. I've done everything from super light organzas to drapery-weight cotton twill on this thing and it's still going strong.
I haven't bust into the ProFinish yet to use it, just to bask in the new-machine smell.