What you are describing is radius arms (rubicon express / fabtech / tnt customs). Avoid these setups if you can.
There are lots of folks who do homebrew longarm kits on their TJ's.
Clayton's long arm kit (again, radius arms) is by far the best bang for the buck. It includes everything you need to get a nice longarm setup on your rig.
If you are more into the serious do it yourself go to
www.polyperformance.com for some frame and axle brackets along with suspension joints and start going crazy. They sell everything you could need to do a long arm kit on your TJ.
Many folks go with a front 3 link design with a panhard (track) bar. I would stay away from radius arms if you could.
If you do go with some sort of home brew diy kit check out "Full Traction" suspension systems and copy their designs.
Also, many of the suspension manufacturers will sell you just the parts to their kits. You don't have to buy the whole system. For instance, the clayton long arm system with lift for a TJ is Around $3000, if you call the company and just want to buy the arms and frame brackets without the rest of the system, they would be more than willing to accommodate.