im no expert but this is my humble opinion, 2 weeks ago i collected my new ra05 se from my local audio T. i needed to replace my arcam a65 as i was not happy my previous amp was a nad c352, anyway i did audition the marantz 6003 the new nad c355 and the rotel ra05 se i found the marantz very detailed but lacked the power and pace and excitment of the nad, but picked the rotel because it had the detail of the marantz the excitement of the nad but the bass was not over powering like the nad can be at times drowning out the detail, the rotel ra05 SE was happy with all types of music the timing and pace was spot on just like a nad the detail was presented to the listener but never forced it was all coherent and the presentation was the best of both worlds.
i was at first concerned about the 40w per ch. of the ra05 as my nad was 80w per ch. but with my M.A br5 and arcam cd73tdiva it sounds great and has plenty of power.
hope this helps, the best thing to do is listen for your self and only then can you make a decision.