I've owned a grand total of 2 valve preamps in my life the Radford SCA-25 preamp and the Croft Micro-Basic. Both are great amps but I'd like to evolve my valve system to the next level. I've been thinking about some Audio Research kit with maybe a decent pre and and a couple of monoblocks. I'd be quite happy to accept recommendations for new kit, and would be prepared to spend quite a bit on old reference gear. Budget is somewhere bewteen £5-15K. Any ideas?