Last edited by babysnoop; 08-07-13 at 01:27 PM.
Depending on how good the condition of the wheels is (in or out of true, dings/dents in the rim, bearings, etc.), either would do the job; the Sun wheelset is a shade better overall.
They will not work with your 7-speed shifters; but 8-speed cassettes are cheap, as are 8-speed SRAM shifters. I haven't seen much about 7-speed cassettes lately, they MIGHT still be available.... Are you using SRAM shifters, or was that just the bike the wheels have been on?