I own the deathadder chroma and find it perfect, the ergonomics are fantastic, but then again I have relatively large hands, idk... :/
However I have friends with normal sized hands that use it just fine.
I can't see myself using any other mouse, I tried the rival 100 a while ago and didn't like how low it was, and I didn't like the side finger thing on the G402.
Like I said, best to go into a PC store and take a look at mice, they're generally helpful.
Just don't buy from a GAME or mainstream store, buy from places like Aria PC, CCL Computers, SCAN UK or Novatech, a few of those have stores across the country, take a look at what's around you, just google PC store and check who has the most competitive prices comapred to PC Part Picker.