If price isn't a big concern:
HK P7 PSP or M8 - the M13 loses the magical feel, even with me having medium large hands, it feels very thick
Browning Hi-Power - you can get thinner grips and improve it further
If it is a big concern:
XDM - the slide is very blocky, but the grip is quite slim, even for the .45!
Ruger SR9 - at least one or more steps down from the XDM, but tons of value