I'll throw down a couple a eBay sources for H2 front end kits.

AcDelco

2x Front Inner Tie Rod End - ES3488
2x Front Outer Tie Rod End - ES3609
1x Front Pitman Arm - K6654 (3 Groove Spline)
1x Front Idler Arm - K6535
1x Front Idler Arm Bracket - K6723
2x Front Lower Ball Joint - K6693
2x Front Upper Ball Joint -K6696

AcDelco $429: AC DELCO Steering Pitman Arm Idler Bracket Ball Joints For GMC Sierra Truck HD | eBay


Moog $596


2x Front Inner Tie Rod End - ES3488
2x Front Outer Tie Rod End - ES3609
1x Front Pitman Arm - K6654 (3 Groove Spline)
1x Front Idler Arm - K6535
2x Front Lower Ball Joint - K6693
2x Front Upper Ball Joint -K6696


MOOG New Steering Pitman Arm Idler Bracket Ball Joints For Chevy Serie Truck HD | eBay

 

Ditto. I use them and when they wear out...they are free.

 

I am in the same position as the OP, has anyone used Fabtech or Rareparts? Any feedback on them?
I want to upgrade from the stock and definitely want something heavy duty.

 

Both brands have gone through various "generations" and some had issues and some did not. That was why I went with the Xtreme Duty tie rods from dmaxstore.com. All the other parts I went with MOOG heavy duty.

 

The Kryptonite components from Dmax store have been pretty good for me. I've had the hubs and tie rods for years with no problems. Just bought the Kryptonite upper and lower ball joints and installing them tomorrow. They all come with a lifetime no questions warranty. I'm pretty sure last time I replaced the ball joints they were Moog(could be wrong, probably am) But they didn't last very long. I'm pretty rough on my H2 and 40" tires don't help. So pretty much everything I replace on it is high quality. It saves me money in the long run. The only OEM parts I buy are CV axles. They're only around $70 at pretty much any parts store and have a lifetime warranty. I keep a spare pair for hardcore off roading. Beats paying over a grand each for the high end ones.