I know that idea is somewhat costly comparing to others network . But while focussing on its network and usability it has widest and fast range. The primary purpose of any operator is to provide a good network and idea is doing well its job.
Idea internet services is also so fast . Whether it will be 2g service or 3g service or lte service.
It also provides a good coverage in all the states of india. Almost everywhere.
So according to my opinion go and Get idea.