i vote for keeping the original sample rate. for archiving.
if you need it for a CD, make sure it's 44.1.
if you make it for DVD-Audio, make sure it'ss 48.
ssrc gives the best sample rate conversion qualities.
it's open source, iirc.
not worth it so much to buy the most expensive audio editing tool based on its sample rate conversion.
check SSRC against other sample rate converters here.
SSRC Comparisons (
http://anonym.to/?http://src.infinitewave.ca/)
same goes for bit depth.
if it's 24bit depth, keep it 24 bit depth.
if it's 16 bit dpeth, keep it 16 bit depth.
if you want to down convert, do some research on "dithering" and see if it applies to you.
different dithering algorithms give different results, most often based on different music styles, genres, and structure.
converting to a lossless codec is ideal. save space, keep quality.
FLAC is the best. Despite it not being supported on stand-alone players.
The compression is good, and the seek-time is excellent.
Many will say APE gives the best compression ratio and is supported on devices like iPods and other Mac stuff.
However, it's seek-time is extremely horrible. There's about a 2 second delay before it jumps to the position you want it to.
This could cause some problems for some players.
It's just down-right awful of a lossless codec.
FLAC is the way. Although it still many bugs and hasn't been updated since 20007, it's still the all-around universal lossless codec.