Well, I went the DIY route. I've been a gunsmith for a long while, but had no experience with the '73 or '92, so I did one of each. I never intended for the '73 to end up stroked, but once I got started, I couldn't stop. :-) Now, the rifle has a pioneer super short stroke kit and aluminum carrier, whisper lever and carrier springs, coil type lever safety spring, lightened mainspring, and all the appropriate action work and smoothing, plus some marbles sights. It works slick as snot, and is faster than I am at this point.
That being said...
If it weren't for the intent of learning how one of these things works, times, headspaces, what to smooth, and what doesn't matter, etc...it would be hard for me to say it was a cost effective endeavor. I ended up with about half way between what Cody charges and what Longhunter charges for completed rifles, that doesn't count that I had everything I needed tool-wise to do it right already, and I get no warranty. It took a long time. Quite a few nights at the bench. Sure, if I'd left the stroke and carrier out, I'd have had a very, very smooth rifle for not a whole lot of cash...but it's MUCH nicer shortened up a bit. I have a decent baseline understanding of the platform now, but I've got a lot to learn before I consider myself an old salt on the '73, and some things can be a bit counterintuitive in between those side plates.
So...if its a money thing, it's hard to come out ahead of where you'd get with one of the smith's that specialize in this. If you're a decent gun crank, and you don't mind scratching your head a bit...I got great results with the PGW super short kit and aluminum carrier. I will warn you that there were some additional fitting steps beyond what's found in the instructions, and it would be easy to screw up if you didn't understand the timing. Also, if you don't slick it up well, it will end up being a lot more like running a hi lift jack than levering a rifle. So if those things are concerning, then send it off.