The Digisix looks interesting. Anyone know if it counts seconds as part of the timer? My Minolta IVF is getting wacky, so I need a new meter, and one with a timer would be good for pinhole cameras.
Also of interest:
If he gets it all working, I'll probably build one of these, and for many of the same reasons.
I use Sekonic L-208 with TLRs.
(Go down to halfway to near the bottom to get the image you want to see.)
It does both reflective and incident, and it's good enough for most situations, as long as you are shooting negative films. That I don't need a separate hand to hold the meter counts a lot.
When I shoot TLR on a tripod I use L-408 or other meters. Indeed L-408 is my favorite all-round meter.