Turns out I need a new Pitman/Idler, and passenger side hub.

Can I go with something like this along with the Cognito support kit?

http://www.ebay.com/itm/Upper-Lower-...f9fd07&vxp=mtr

Or the other option would be MOOG pitman/idler with Cognito support.

Seems it would be a good idea to just re-do the front end while it's apart, at a cost like the EBAY link would give me.

Hubs- should I just replace both while I'm at it?

I found these both searching the forums and on Ebay-
http://www.ebay.com/itm/03-06-Hummer...item2c52c9977c

50k on the truck, no off road, no lift, about to get rid of the M/T tires and go back to an A/T OEM size.

 

I think your on the right track... I had a similar situation, I have a 2007 H2 that just rolled over 50K. At 45K miles I upgraded the tires to 37X12.50 BFG AT and had a set of Cognito keys installed to level the front and make room for the new tires. I started getting some vibrations and shimming from the steering wheel at 45-50 MPH. Took it for an alignment and was told that I needed new Idler and Pitman arms. Like you, I figured I just so some other upgrades while I had everything apart.

After some research I decided to do the following:
1. Upgrade the Idler and Pitman with Moog replacements.
2. Replace the steering stabilizer with a Rancho. (Wanted a Bilstein, could not find it locally)
3. Upgrade with the Cognito support kit.
4. Upgrade the the Tie Rods with Kryptonite replacements.

Completed the work last week, haven't driven it to much yet but the steering is much tighter and more responsive.

The wife also drives a 2007 H2, (stock wheels and tires) I'm considering the Cognito support bracket upgrade for her's also.

If you haven't seen this yet it's a good writeup on the support kit, worth checking out.
Pirate4x4.Com - The largest off roading and 4x4 website in the world.

Hope this helps.