Nice review...I'm also getting one but a friend is bringing it over from HK. They quoted shipping by air to Los Angeles for $39. In addition, I asked them to have the opamps socketed and they charged me $15. That would make it easier to try a couple of OPA 627 that I have. I also got a extra identical case for $12 and a +- 15V regulator for $9 (you can see all of this in their website). So I plan on moving the transformer to the other case and installing the regulator board to power the analog (opamp) section.
In looking at the schematic, the output cap may be completely removed, if there is no DC coming out of the opamps (in theory there shouldn't as the opamp has a differential input. But better make sure by measuring it. In any case, if the preamp has a input resistance of 50K, then the cap can be replaced by something of smaller value (maybe 1-3 uF) and of better quality. the MSB link DAC (which I currently have) does not have output caps after the opamp.
In reading the AA boards on modding the MSB link DAC, it seems 80% of the benefits can be obtained by improving the analog power and by replacing the opamp. The use of soft recovery diodes is also popular.