I've had two dremels over the years.  They were great.
I didn't have much $$ last year and I needed a new one, so I got a Black and Decker.  It's every bit as good as a dremel, uses every one of their attachments, and costs less than half.  Didn't come with many bits and bobs, but I already had a ton from my previous ones.  So you guys might want to consider that and then just get a bit assortment that fits your needs.
Stuff I use frequently:  diamond cutoff, large cutoff wheels, various sanding wheels, round engraver, tungsten cutter, flex shaft, dremel station, circle tool
Crap, don't buy:  quick-lock cutoff wheel, stone grinding wheels, polishing wheels