If you can only buy 1 more gun I would go with a EAA Witness.
A EAA Witness you may ask, yes I say. You can get the full size steel or poly gun and then you can get conversion kits for it. You can get .22, 9mm, .40, .45, 10mm, and 38 super. So buying one gun you can in a round about way get 6 guns.
The Witness is a cz75 clone, I have one in 10mm have put about 1000 rounds down the pipe this summer and it is my daily CCW. Now every body hands are different I LOVE the way it fits in hand. It is like it was custom made for me. I can not recommend this one enough.