I've built up several bikes, including my 62cm LHT. (I'm 6'4" also, but weigh 195.) When you have lots of time and are willing to take a chance on used parts on Ebay, you can build for not much more than a complete. But on my touring bike I didn't want to be out in the middle of nowhere with failing components. I wanted strength, reliability, and quality. Hence I went with almost all new parts, and equal or better than the complete LHT (it wasn't available as a complete when I bought mine - it was about half a year beforehand.) I'm sure I spent at least $1,500 on the whole rig, maybe more. (I didn't keep track, because I didn't really want to know.)

The cost was the downside. The upside was that I got exactly the bike I wanted, I learned a lot about working on it, I ended up with some good tools (not included in my estimate of the cost), and I had a lot of fun and gained a feeling of accomplishment out of the whole project.

Mine has 700 wheels, but they now offer a 62cm with 26" wheels.