keep your eyes posted on pirate for cheap already built hp44s, but be careful. I picked one up and did not pull it apart at the dudes place and both spindles were toast, bearings were iffy at best, one lockout was fubar, one bad bad hub, bad ball joints, and a shot U joint with a stock shaft, so don't be afraid to be thorough when purchasing used. Thats the reason my personal experience with a hp44 ended up costing a ton of money(+gears, master install, ARB shim kit, etc) , but experiences may vary. If you find a built 900$ hp44, you might get lucky and have good hubs, bearings, ball joints, etc and literally just weld up brackets to get it under your XJ and drive away.
Just make sure you open up an excel file, run through the numbers for a built 30, a built 44, and a cheap 60 build in three separate columns and understand and jot down the pros and cons, costs savings for each scenario, all with respect to where you wheel and your desired wheeling style. Make sure you take into account what you are breaking now, what your buddies are breaking, and how/when they are breaking it-- are they flooring it like crazy people up bonus lines or taking bypasses and taking it easy.
You may very well be solid on your dana 30 , on some used d30 chromos , home made truss, knuckle gussets, heavy duty cover, full carrier locker , but remember things like R&P strength and brakes .
Most importantly its where you wheel , who you wheel with and how you wheel. I went years and years on 35s and a d30 running things like the rubicon with no issues whatsoever. It wasn't until I started to change how I wheel, where I wheeled(mostly talking about bonus lines that are avoidable ) , and who I wheeled with that I started to break , keep that in mind that if you keep it sane you can build a 30 that lasts. that being said, talking to the guys back east and in NY while in the

MOAB event last year they all seemed to laugh at us cali guys for swearing by 30s on bigger tires so much since so much of their wheeling is throttling steep muddy clay-like climbs. While in MOAB we had a ton of guys doing everything out there on dana 30s with 33s and 35s so you should be fine if that is your preferred terrain .