I had a bad experience with Indy Fab, when things went wrong they were utter shits to be quite frank about it. I lost $500 in the process.
I’ve got a Soulcraft if you’re considering steel, I’ve not built it up yet but apart from looking great and the service being seamless ( a longish seam) I’d recommend them. Much cheaper than TI too.
Also, have a steel Enigma which is the actual one tested by Singletrackworld in the mag a few years back – I’m sure a search will reveal the article. What I would say though is that the guy who made my frame no longer works for them, so can’t really vouch for the new master frame builder there – but no reason to think otherwise. Another thing, they said to me when I was there (I did some work for them) was when they gave out frames to sponsored riders, the riders were happy to give back the Ti frames, but managed to hang on to the steel in some cases – good steel rides nice.
If you can afford it, Steve Potts or Eriksen for US Ti