FS/FT, all 15# with a span that is roughly 4-3/8x4-1/2:

Motiv Primal Impulse - single drill, VERY low games, cover is 10/10 - $50 + shipping
Motiv Silver Recon - fingers moved for span, 50-70 games, dented a bit on the bottom of the thumb, cover 8/10 - $30 + shipping
Track 503C - single drill, 30ish games, cover 9/10 - $45 + shipping

Span is a little smaller on the 503C

Pictures are available here:
http://bowlingballexchange.com/showthread.php?t=49404