Hi Guys, thanks for your very helpful suggestions. While I am very keen to go back to directly heated SET, from what you mention above, I'm not sure the usual fare will be "powerful" enough. Tannoy recommends min 50 watts, but the specs (99db 1w/M) suggest that 8-10 watts would be enough. I have read Jeff Days reviews(and chatted with him) and he loved the Sophia 300b's with the Wests as well which seem to bare this out. Also I tend not to listen at very high volumes.
Off the back of your suggestions I'm going to take the following, pragmatic approach.
1. Run the wests with my current(no pun intended)amps.
2. Try a number of SET amps that I can demo from local retailers (I'm in NewZealand so not in plentiful supply).
3. Off the back of that determine if the Low powered SET approach will work for me.
4. If I enjoy the SET over my existing amp selection, I'll buy a suitable "special" one having saved up enough to spend 10k ish on something used.
Then I'll have to chat to you about pre-amps !!!
Thanks all for helping me to this decision. I'll let you know how everything works out.