I would suggest posting a message on the original head-fi.org forum thread.

There many people who have done this mod and many people who have refined the procedure. I am sure you will be able to find someone willing to do it for you for a small cost.

Good luck.

I think there is two approaches for the mod :
- portable solution with BG capacitors or similar, the 47uF BG is good for the size. Perhaps, you could use bigger caps with 80gb plate but I am not sure because the size is always limited by the CF adaptor! The improvement will not be significant.
- less portable but more audiophile solution with big capacitors outside the ipod (nichicon, blackgate, sonicap, etc.). See the headfi thread for examples.

When you say size do you mean electrical size or physical size??

The capacitors sole purpose is to block the DC component of the DAC output. The capacitance, source resistance, and load resistance go on to form a high-pass filter. Unless you are feeding the output in to a very low resistance input then any capacitance above 47uF will be more than enough.

However, we are talking audiophile here!!! so rational discussion is really thrown out the window – so buy whatever is the in-thing and buy the most expensive and biggest that will fit

I personally think the capacitor Eric used is fine, sonically and physically – unless you are trying to ring out the final 0.000001% of quality improvements then it will be ok!!!