3 Button Mice Suggestions

So, this game is making me wish my middle mouse button wasnt so tall and was easier to use.

Anyone have any suggestions on a good mouse that has a nice low wheel or something else in the middle that will still zoom in and out.

Also any with not to many but a few thumb buttons (more than 1) that are easy for a thumb to reach would be cool.

I use a Logitech g500

Have the middle mouse and two flasks set up on the three side buttons, don't think I've ever used the middle mouse button as intended.