The only metrics I considered were capacitance, voltage rating, and size (important especially for axials for this board in particular). Also reliability of the cap technology was a concern and would choose the higher reliability spec'd component even if it costs a bit more since I would rather not have to recap again. I haven't heard much brought-up about other electrical properties...

Here is what I ordered:

Axial, 470uF (higher temp rating): http://www.mouser.com/ProductDetail/Vishay/MAL211835471E3/?qs=pM1VCyfkp0BLY7e18zSsBw%3d%3d

Axial, 220uF: http://www.mouser.com/ProductDetail/Nichicon/TVX1C221MAD/?qs=QZuYiDxzHajjB3DlyUoxegdu%252bVF7XitxnRcPC7HYP2Y%3d