ARC VT 100mk ll or mk lll or Bat 75SE?????

I currently have an ARC VT 100 mk ll power amp........this is used to drive the top section of my Infinity RS1B's....I am thinking of upgarding to the Mk lll version but just read a review and heard so much about the BAT 75SE I am courious to hear from anyone with experirnce with the mklll ARC vs the BAT.
I expect to hear the BAT this weekend at a friends home so I know that will be a great help in deciding however, I do like the ARC and was wondering about the upgrade....love to hear from ya!

Thanks team!