go with the heavy, for sure. I ordered mine, got the LJ (unlimited) heavy springs. they are even stiffer than the HD TJ springs. I am running a soft top now, but will be putting on rock bumpers front and rear, and a winch on the front. Soft springs and usually for stock jeeps with softtops, mostly on road driving. I went through Dirk at DPGoffroad.com. He recommended my setup.
04' Columbia TJ
33" BFG AT's, OME HD lift, front airbag suspension, teralow 4:1 kit & supershort shaft kit, TW CV shaft, 4.10 gears, JKS body lift, track bars and quicker disconects, Warn 9.5ti, warn front bumper, garvin wilderness rack, and solid cast aluminum tusks,