Wow, thanks for the responses everybody. Keep'em coming.
I was up into the wee hours of the morning last night looking at suburbans between the years 2003-07. I'm only looking for 3/4 ton trucks as I'm assuming is has a more stout frame. Please correct me if I am wrong on this point as the price difference between the 1500 and 2500 is significant.
I think it might clarify a couple of points. The purpose of building a capable off road suburban isn't to "see what it can do" - I will never take it on the several obstacles I've seen in Moab (like the hot tub) that guys run their trucks into just to see if they can get over, out of, or through them. I'm on my third off road truck in a year (a 2001 Range Rover, and two Land Cruisers) each more capable than the last. Every time we've 'upgraded' and increased the capability of our 'adventure vehicle' we've had more fun and been able to explore more places.
Also I've found that outstanding equipment can sometimes compensate for lack of driving skill

- Off-road driving skills and techniques are still something I'm learning.
To summarize, it seems the consensus is to go with a newish truck and swap out the front suspension with a solid axle - a dana 60 seems universally liked. Coil over front suspension from a place like ORD or similar. I'm less sure on the rear suspension.
I've also received many PM's with things like "put a 8 inch lift and make it a monster". While I appreciate the enthusiasm, I find it more useful speak in terms of increased wheel articulation. I really would like some 37 inch tires (maybe larger?) however, as I feel I can still get good highway performance out a tire that size, but also make going over obstacles easier. In order to do that a lift is certainly going to happen, but I'd prefer to stay away from excessive height - I want enough to get some larger tires and have room for an awesome suspension.
I've also received several suggestions as to garages where I can have the work done. You all correctly assumed I'm not capable of building something like this myself - I can however divest your 1032b fund from commodity based derivatives using futures supplanted REITs while harvesting tax losses from foreign currency credit swaps.

Any other shops I should consider?