Replying to Best glidecam/steadicam for HDSLR???

Hey so I've got a Nikon D7000 and I'm looking to have some shots with fluid motion in them and with my limited budget it seems that glidecams and steadicams can produce some amazing shots.  My question is I want something that I can use to get steady, smooth shots but I don't want to spend more than $500.  I will be using this mostly for filming fly fishing and hunting so not any high speed super bumpy ski shots.  If anyone has thoughts on this I'd love to hear them.  Hope to buy one in the next few weeks.