Keep them all, and jettison Finley (if possible), Udoka.
Having Ian, Pops, Gist, and Hairston would be a nice influx of youth to an aging squad.
Keep those four, and for the other 11 spots you have
Parker
Hill
Mason
Manu
Duncan
Thomas
Oberto
Bowen
Bonner
I suspect with the economy sucking world wide you will see Tiago come to America for what he can get.
That leaves one roster spot. If I were the Spurs I'd package all three of those second rounders to some team that is feeling the league's financial crunch and wants to get out of a guaranteed first round pick and move up to grab a SF prospect, and we'd be set.