Hi Genghis,
Good advice from Conan.
I've got a Nikon Coolscan and just bought a multi feeder which works great. 50 slides, batch scanned and you're off. If you go this route, I suggest you buy Vuescan (scanning softweare) which does the job automatically.
Caveat Emptor: Now all this comes at a price, so weigh it up carefully. If you sell photos too, it'll pay itself back in no time or if you've got LOTS of scanning to do AND you'll use the scanner in the future, buy a Nikon 4000 or 5000.
Also try Ebay and see if one's going second hand. The mad rush towards digital may mean you'll get one cheap.
All the best
KD