I would recommend holding on with your purchase, instead, go to a workshop, read this forum from cover to cover and also two important tools that you should get before anything else is the The Steadicam® Operator's Handbook http://www.amazon.co...y/dp/024082380X and The Steadicam EFP Training DVD http://www.steadicam...am_efp_dvd.html These two references are must have and you will find yourself going back to them even after you bought your rig.
Steadicam is similar to playing the guitar, you can take a ham and pretend you play for a while but if you get serious, you will need some lessons and learn about the basics of physics of the tool. After a bit of training you will then know what you like and dont and you will get pickier on the kind of instrument you like to use. Same with Steadicam.
Steadicam is expensive and such a big purchase shouldn't be taken lightly. As said before, look around your area and contact some operators to see if you can meet or talk.
Hope it helps,
Fly safe and welcome.