Last year I bought a gaming PC and all the accessories I got with it were made by Razer. The mouse I had at the time was the Mamba, but a few days ago I decided to give the Imperator a go. To me, it's like they took the Mamba and made it better. The overall design is great for the palm, there's also a useful thumb groove. A problem I had with the Mamba was that my thumb would occasionally scrape my mat, but no longer with the Imperator. You can also change the DPI settings to your liking, for example, some mice, like the Abyssus, have pre-set DPIs, but with this you can tailor to your exact needs. Two buttons on the top of the mouse change the DPI up and down, there's also a handy on-screen display of what your current DPI is. The two side-buttons can also be moved towards the front or back of the mouse. I was surprised to see how sturdy the mechanism was, at first I was a bit sceptical. To me, it's not a big deal, but obviously it depends on your game or style.
This is a pricey mouse, but trust me, it's worth it. If you feel that it's still too much then I would recommend looking at other Razer products such as the Deathadder or Abyssus. Razer products may not be the cheapest PC accessories, but they are well worth the money you put down for them.