Best mouse with 4-5 side buttons?

So, recently I've been looking for a new mouse because the one I'm using now (Logitech G600) isn't an fps mouse and I've been having a lot of problems with it. My problem is that I have become completely dependent on the first 5 side buttons to switch weapons. I'm not sure which mouse I should get, but I'm thinking about getting the Zowie FK1 or 2 because there's 4 buttons on it. You're probable asking why haven't I bought it yet? The only reason I'm hesitating is because I'm not sure how I feel about the buttons being on the other side since I'm so used to them being right where my thumb is. Is there any other fps mice that have 4-5 side buttons?

EDIT: G600 not G900 I got them mixed up.