Talenn:
You're welcome
You will probably find the AI diplomacy a bit lacking in SE4 as well, but they are decent with brute force military, especially the modded AIs such as the TDM pack.
The Play by Email ability will really shine for you there too.
Be sure to visit
www.PBW.cc as well, for automated hosting of SE4 games, and the option to upload turns through the webpage or email attachments.