Having had the same arcam kit as you, Rotel Pre and Power and various others over the past 15 years I would recommend listening to a Naim setup, perhaps the Nait XS amp £1350, and the Naim CD5i. I did last year and it completely changed my outlook.
Personally I found I missed the incredibly detailed sound that the Arcam produces. But after a while I realised the Naim for me produces a more musical sound. For very little money even a budget Naim setup would give you a very musical sound. It's so engaging, it compels you to listen and enjoy the music rather than analyse it. All Naim equipment has the solid pace, rhythm and timing that characterises the Naim sound. It's wonderful.
I'm certainly a huge Naim fan, I don't think I could be swayed to have anything else now. Currently using a Naim pre and 150x power, CD5, Rega P3/24 through a Naim Stageline N, all firing out of a new pair of PMC GB1i's. Can't fault it. The 150x has plenty of umph where you need it. The whole system sings. Regardless of the fact it's classed as entry level.
There is one significant problem with Naim - it's so good that you once you have the Naim bug it's hard to stop investing more and more and more and more and guess what... more cash.