I had 2 737's, traded for a Manley dual mono/elop and I've used the tube tech pre's before and none REALLY blew my skirt up. All were good and very useful, but not exceptional. When I got my tg2 I didn't even make it a bar into the music before I smiled ear to ear and those other's didn't really make me do that. though, again, they are good and compitent peices . . .
if i had the chance/cash to do it again i'd check out the pendulum stuff. or the dw fern if i REALLY had the cash