RE: new gear advice. kinda long
Strings - Winners Choice is definetly the best choice of the 2 you listed. I am a 11 year Mathews shooter, and would not use a Zebra.
Personally I think Bucknasty makes the best string out there.
G5 Meta peep is nice, and I had one myself and took it off.A lot ofpeople have hadproblems with the glare. You can do a search on AT, and see a lot of threads on Meta peeps.
STS - I have had a STS, and the MeanV CSS. Both will reduce vibration for sure. I like the design, and looks of the MeanV. That is what I currently use. It will be personal choice between the two.
I have no experience with the Limbdriver, or the Windstalker.
Hope this helps.