I used the search function and read about what others have been using generally for light weight heads for their Bergantino NV610. I've heard that the Thunderfunk TBF550 and the Ashdown ABM 500 EVO II are the two big ones that people have had really great responses with. I currently use the Iamp 800 as my default light weight rig, and while I think it sounds awesome, i do think there "could" be a better sound or better head for me. It could be the gas talking. For the type of music I play, (Rock & Pop of most varietys), I think that I could probably use a different sound than the Iamp800. The only thing I worry about is the amount of volume or headroom I can produce with the thunderfunk or ashdown. The Iamp seems matched perfectly in terms of wattage for the NV610. What other options do I have that will be light weight and satisfy my needs? edit: See Post #36 for an update.