Thank you all for your help. I am going back to the store today.
I have decided to by the Magnum .46 Because it sounds good value. If he has the pro series TT I will also take one of those, And finaly, if he has the recent model of the Siato, i'm gonna have one of them as well, because I got a buzz out of just holding it. I am sure to use them all at some stage.
I think for now though, if he has the pro TT, that will go in the SS40, or maybe the magnum or the Siato.
Thanks again guys. I might just try them all, the SS40 comes with an ajustable engine mount.