You can use enlightenment on any BSD distribution.
It is present in every distro.But i don`t know how much experience you have on BSDs.
The most easiest and best for beginer is OpenBSD and NetBSD.
I will recomend OpenBSD if you are a starter.I am recommending due to its packages collection which is easy to find and stable.
The most Flexible is NetBSD.You can alter this according to your needs but you must have
some expert level.
If you want to Use BSD on "as it is" basis then Use FreeBSD 8 version and install all of your required packages online.Once ready i hope you will not need to change something.
And if you are a Nix Expert then use DragonFlyBSD.