Some people want to stick with big brand names - nothing with wrong with that. So if you're looking for my suggestion in this area, one of my favorite Stabilizer + Vests combinations still to this day is the hybrid Steadicam Merlin Vest + Glidecam HD4000 Stabilizer.
Obviously the Glidecam Stabilizer can be used without a Vest, when you just need to fly hand held. If you need the extra support for long hours of Steadicam work, you can mount the Glidecam to the Steadicam Merlin Vest (with an adapter).
The ISO ARM on the Merlin Vest can be dialed to fly both lightweight cameras as well as medium weight camera systems. This is a true 'Steadicam' branded vest, and build quality on the ISO Arm is top notch. Typically this vest runs $1600 dollars (some retailers still list this price), but recently it's been discounted for just
$995 $849 (found here).
Now i'm not a fan of the Velcro straps on the actual vest part. So the only other thing I highly suggest getting is the Buckle Upgrade Kit (found here). This little kit will get rid of those nasty velcro straps that are both noisy and will eventually wear out. You can find that kit below (click here).
Steadicam Merlin Vest Buckle Upgrade Kit
So if you're working with the Glidecam HD4000 (or similar post) Stabilizer, to mate the two you can either DIY an adapter (as seen here), or you can pick up a ready made post from Berkey designed specifically for this Hybrid setup. Here's a link to the adapter required to allow the Glidecam Stabilizers to work with this Steadicam Merlin Vest.
Berkey Glidecam Post Adapter to Steadicam Merlin Vest