well - as much as performance or anything else, the ride is as important as anything to me. you mentioned that combination rides like a truck, and I don't want it to ride like a truck. if that's the case I need to explore some other options. look at total costs (also maintenance costs).
anybody have any sources where I can look at the IRS suspension? (installation, components that come with it etc.) somebody had mentioned regearing is only $50, and if it has disk breaks that would be a bonus.
TCI has a rear 4-link kit too (that I just noticed today on their website that is made for this app too). I'm sure there are better options, but for a novice it wouldn't be terrible to use it. it comes with instructions etc. that would almost make it a bolt in, and would require no frame mods. this wouldn't be a cheap option though.
don't know if I'm more decided now, or less decided.