well, they come from the factory unstrung, so their is no 'stock' string, what did your shop put in it, do you know?
I personally like a softer poly at around 55, but Meaghan is stringing his in the 40s!
I am currently using Solinco Outlast but will switch to Kirschbaum pro line evo soon. (now, which are the best blue OGs? hmmm)
5.0 all courter. Dunlop Bio 400T with cyclone @ 50, Prince CTS Precision 90
"Tennis isn't easy" - Corners