Yeah, I looked at getting a trac-hoe with a tiltrotator on it a while back. I think it (the tiltrotator) was $800-$1500 depending on mfg, size and options.
Makes it almost like using your own arm!
As a former equipment operator, I've been looking for one of these for a while.
Just make sure to give it a good look-over. Check for cracks (and new paint covering cracks) everywhere, but especially in the boom, at each pivot point, and the undercarriage.
Check hydraulic leaks (it's probably going to have some, unless it's empty

), smooth starting and running, and smooth boom operation. It's good you have someone to go with you.
I'm jealous too! Did you find it on Equipment Trader?