I use a Palmer Macht 402 power amp . Can be used in bridge mode to give 400w into 8 ohms or stereo 2 x 100w into 8 ohms, 2 x 200w into 4 ohms. Lower power ratings into 16 ohms.
1u rack size and basic teble and bass controls on front panel too .....Not heavy, sounds good and a better option than the Matrix imho
Monitors I have are a 1 X 12"Boogie EVM 12L (200w) and/or Celestion Redback (150w) 1 x 12" cab