There are so many out there it’s hard to sift through.  I have narrowed things down to 4:

1.  Ipfire

2. Astaro

3. Untangle

4.  Comixwall

Depending on capabilities and budget those are the 4 ECC is going to be choosing from for the foreseeable future.  This makes it easier for my clients to know what i am offering and makes it easier for me since i’m not suporting 10 different server packages.  I intend on narrowing it down to 2 in the near future.