I just had shoulder surgery in October as well - still not even able to do upper body exercises except for what PT has "prescribed" - I am planning on slowly working my way up in upper body weights (um, once they let me start- probably next week) and starting STS in March - that should give me plenty of time to preview the DVDs and get my 1RM testing done. I originally thought I wasn't going to be able to do STS, but my ortho told me it will not be a problem... But i'm not sure what type of surgery you had? I had a subcromial(?) decompression and removal of spur so my surgery was relatively minor - although you wouldn't know it by the aches I'm still feeling in the bone!
I say KEEP STS - you may not be able to use it right away - but you WILL get to use it....