I do have a very nice Hafler 600 here that can be built into an Insight+ 600 with way more than 300W/Ch and safe operation into 2 ohms.
The rebuild cost is $1599 (it uses 16 double die Exicon mosfets) and we will throw in the chassis for $200.
Huge power, very clean and musical, and rugged as an anvil.
Frank Van Alstine