These rigs are great. I have a 99 and 00 limited. I like the TBU as my calipers were seized anyways, and will do it on the second one soon once some brake pad wears down more.
I wouldn't be too worried about the pink milkshake just because trans was flushed at the same time....wouldn't be surprised if simply they were in a freshen up the fluids phase and the top of the radiator was showing green/cracking plastic so it was all done at once.
Depending on how you are sitting, I think my favorite "mod" so far has just been suspension restoration. Get the lower ball joints done with OEM parts (pricey, but the job is easy to do yourself so that makes up for it), but then depending on your suspension situation, I'd look to replace the shocks and springs and get a couple of inches back to where it should be, or take it up just slightly if you want. It will ensure you can full clear 265/75/16 tires.