I will be fitting an HKS EVC IV to my car. I managed to find a limited edition version which has a whiteish backlight which matches with the backlight for the aircon.
Anyway it is not that hard to set up and program. If you go to hkseurope.com you will be able to read both the setup and fitting manuals...good place to start to get an idea on what to go for.
The others, Blitz or Trust are also good but i really don't know anything about them
Oh...and the HKS EVC comes in 3 specs EZ(very simple functions) EVC IV and EVC pro