Thank you for the wedding wishes! I actually just got back from Costa Rica yesterday, the wedding and Honeymoon was quite an adventure!
To answer your questions. With the amp being near silent as it is, I don't believe a better power supply will have a good cost/benefit. You'll probably need something much better than a simple Tangent THREAD, your definitely looking at either the YJPS or AMB's sigma 22 to improve on the on board.
The wedding/honeymoon pretty much blew my budget for head fi for a while. I was going to try some opamp rolling (maybe pick up the OPA627 or Burson discrete op amp) and do the Class A biasing as detailed on headfonia.com and in the M-Stage thread. The next major mod would be to purchase another Lovely Cube board and create a balanced version of the amp for my HD650's.
Yea, I'm thinking of building the sigma22 but am really too bummed out and I really should be concentrating more on "real life issues". haha.
If you're interested in the 627, Stephen (lasercollection) actually carries it: http://cgi.ebay.com/2-pcs-Dual-BB-OPA627-SOIC-DIP-Adaptor-/190433490176?pt=LH_DefaultDomain_0&hash=item2c56b87500 . It won't do your wallet that much of a damage and you get 2 of them, one for each Lovely Cube!