I use a Razer Naga from my MMO days. The extra buttons are still nice to have for shooters as well. For example I use them as my strategem buttons in Helldivers. They are also how I switch weapons/gadgets/seats in BF4. One is primary, two is secondary, three is first gadget, four is second, five is grenade, and six is knife. This is probably more than you need for an FPS though so unless you play MMORPGs you can get something cheaper that does the everything you need it to.
I have never had good performance in FPS games or other games that need fast reaction speed with wireless mice. There has always been a noticeable delay to me. Maybe I have just used the wrong mice but the cord doesn't bother me enough to justify this delayed response.