If you get a Glidecam don't go for the HD4000, DSLR's are just too light for it. But the Glidecam HD1000 or HD2000 would be fine and they are very effective and relatively easy to balance.
Quality stabilization isn't cheap though, I'd stay away from the $50-$100 type stuff. I got an HD-4000 and X-10 vest/arm for $1600 used (it's around $2500 new, vest being the expensive part). Of course you don't have to go that extreme, but it makes a HD1000 seem cheap.