madison prophecy for the death metal tone. randall x2 and the dime amp are great s/s heads.
i would love to add the ampeg 140 to the collection. and a marshall 8100/8200 also.
and yes, i hated the isp theta head. i was so convinced i was doing something wrong, i had another bro who could dial in anything borrow it for 2 months. he couldn't do anything with it either. i may have gotten a bad one.....but i doubt it. there is a good reason they are not burning up the forums. how many people do you see playing them? they have been out for years, but we don't seem to see them much.
the isp guitar sub, however.......BOOM!!! greatest thing i ever bought.