this is the audio jack I usually use, I'm pretty sure it will fit.
The 5 pin version might be a little better for the input jack, with the internal switch for disconnect grounding:
I'm using your Digikey BOM - extremely helpful! - and I noticed that was a 3 pin jack. Having that input jack grounded when nothing is plugged in has worked out really well on the O2, using the internal switch. I was going to suggest going with a 5 pin if there was another board re-spin, but on the bigger schematic I see it is already set up for a 5 pin input jack with grounding. Best I can see on the layout it looks like there are 5 holes. Needs to be confirmed, though. On the schematic pin 1 of the input jack is a signal line and pin 2 is the grounded sleeve, but both the 3543 and 3545 jacks have those pins flipped, so it might be necessary to do trace cut and swaps on pins 1 and 2 to use these jacks.
wakibaki: thanks for the higher res print! Works great.
Edited by agdr - 9/23/12 at 2:48pm