cayin vs. primaluna vs. unison for totem arros

Just picked up a pair of Totem Arros for a small room system (my office). Rega Planet 2000cdp. Reading the threads, it seems these are the top three choices for the Arros. I'm looking to replace an Adcom GFP750 and Bryston 4b-nrb with a tube integrated. I know basically nothing about tubes except that I usually like how they sound. How much power do I need (i.e. which specific models should I be looking for from these manufacturers)? I also need remote volume. How many hours on tubes is reasonable? I have no idea when they wear out and need to be replaced. I'm guessing I can get about $1500 for my current pre-amp, amp, and interconnect. I'm willing to spend up to that much but quite happy to spend less. Any advice is welcome. -Dave