Mc2 e45 or ff10000

So uprgading from a pro line 3000 to power 4x void v1000, torn between the e45 and ffa10000, love the sound of the e45 in comparison to the ffa, but have heard it doesn't quite keep up aswell after prolonged use and it lacks that heavy weight bass im looking for. Now the ffa I don't know to much about, never heard one in use and was hoping there'd be someone to share there experience with me (be used 4 ohm stereo). Have also been back and forth with the e90 but just seems far to powerful, however it could happily run x4 of my fane 15xb aswell, and a lot of the venues I'll be using only have a 13 amp supply. Not interested in powersoft as just to expensive. Ffa and e45 are my main choices but could possibly be enlightend by something else. Thanks