[sdiy] [OT] electrolytics specs

[groovyshaman at snet.net]

Ok, I need some electrolytics for +-15V & +5V power filtering on one of my
synth projects.  Typically I would just order general purpose types, but I
think it's time I gain some understanding of the various specs.  Some specs
are simple enough, others not, and some are mutually exclusive.  So I humbly
ask... which of the following specs are the most important to look for when
purchasing electrolytics?

1) low ESR
2) high temperature
3) low leakage current
4) low dissipation factor
5) high permissible ripple current
6) low impedance
7) long life/high reliability
8) safety vented

Any info to help my education along would be greatly appreciated!
George