I'll add another option. I just did some major repair (basically the whole back) using a POR-15 repair kit. Not as bling as welding in new floorpans (it is in effect, fiberglassing over the holes using super-duper-anti-rust-paint as the resin), but if you can't weld (like me), it is nice to have everything you need in 1 box.
-2001 XJ Limited, 4.0L, NP231 w/ SYE, AW4, 4.5" Lift, 32" tires, 4.56's
-1987 XJ Pioneer, 4.0L, NP231 w/ SYE, NV3550, 4.5" lift, 4.10's, D44 rear