Vitus versus Gryphon

You should definitely consider T+A PA 3100 HV on that price range

Gryphon all the way! Plain musical

I heard the Gryphon Diablo 300 and T+A PA 3100 HV driving Magico A3 speakers. To my ears the Gryphon Diablo 300 was more detailed and opened compared to the T+A PA 3100 HV. Maybe with different speakers the results would be different.

nasaman,

I owned the Diablo 300 for a while and have listened to the Vitus sia-030 on Focals like I own.   I think that supermerio’s comments above are “dead on” on all counts.  I personally think that if you have neutral speakers that the Vitus sia series is really nice.   If you wants tons of bass control and liveliness the gryphon Diablo is it.  All of them are great imho.  Happy hunting!

A manufacturer that doesn't get much coverage stateside is Grandinote. Take a look at their Shinai or Prestigio integrated amplifiers should lower power output be acceptable. 

I also second @thyname 's recommendation for T+A ,  as well as both of your choices in Vitus / Gryphon.

All the best.