The e / i debate is interesting. It really works if you have a strong keyword, very rarely will it work for a combo domain.
For example:
iPoker - phenomenal
iPokerPlayer - Not so much.
I personally own several and will increase my holdings as I believe these nams are easy to remember and can be branded seperately from their namesake.
Example - Poker.com vs iPoker.com - I think hes potential to be branded successfully apart.