I believe the current SB Live! models are the CT4760 for the MP3/Gamer/Platinum, and the CT4830 (or CT4832) for the OEM model.
Note that the old Value! is the CT4670, the number of which people can get confused with comparing to the first one I mentioned. Do not get the CT4670. (I don't think they make them anymore anyway.)
Not sure, but i think the 1024 is the CT4760 sold in Eurasia with no extra software besides the usual Creative stuff. You can get it in North America, but it's very hard to find. The CT4760 is the best all-around card.
This is off the top of my head, so take it with a grain of salt. (Yummy!)
CT4760: SPDIF 5.0 V, works with Live!Drive and digital I/O card, has digital input
CT483x: SPDIF 0.5 V, works with digital I/O card, not sure about Live!Drive, most do not have digital input
CT4670: No SPDIF output, does not work with Live!Drive.