I'm going to buy Babolat Aeropro Drive Cortex and I can't decide what synthetic gut to put on (tons on the market). Can anyone help me? I'm a 3.5 - 4.0 player (intermediate player). I want power and control (hate natural gut coz of the price ). From what i've been reading in the forum POSG and PSGD are both great string. I want to work my way form synthetics first to multi, up to poly strings. thanks.