What I think would be good..
Serves - Murray, Ivanisevic, Rafter, Hewitt I'd also like to see the Federer serve improved, this one is too mechanical..
Forehands - Agassi, Tsonga, Del Potro, Soderling
1hbh - Gasquet
, Wawrinka, Ljubicic, maybe Kuerten
2hbh - Nalbandian, Murray, Davydenko
These are just what I think would be good additions to the game..