I know at REI the Yakima Load Warrior is 268.00 new and the Mega Load Warrior is like 368.00 ; don't remember what Thule Moab costs. I have the Load Warrior with an extension which would sets you back another 150, but gives 40% more room. I didn't pay that, since I sell them both. Check for deals usually Yakima and Thule run 25% deals. Having the roof rails on your Jeep is a big plus it will save about $90. Just remember the roof rails can probably handle up 150lbs. So take the weight of the from that which is about 40-45lbs that's what you can carry up there. IF you decide to use some heating pipe I would stick using the Yakima rail grab, since Yakima uses the round bars.
When you get knee-deep in a situation, floor it.