Mike
As Tom has already I also recommend you consider the Woodside STA50 amp. This is effectively a Radford circuit but done by John Widgery who use to work for Radford and who took over production of Radford stuff when Arthur Radford retired. At that time John was not able to use the Radford name. And this unit has been upgraded and checked over by Will Moores (at Radford Revival). This circuit is known to work very well with the Tannoy DCs (ask Tom and Adam). Given that the seller has had this unit in stock for a while perhaps he is open to a discussion on price? Of course you will need a pre but all in will be within your budget.
Had it not been for the fact I already have a Radford (as well as other amps) I would be chomping at the bits to get this Woodside and its known pedigree. (In fact years ago I nearly bought this model directly from John but I chickened out due to the then cost and my budget. I think I may still have the original Woodside literature that John sent me, but not 100% sure, need to check.)
Current: [P20] Roon/Tidal > Custom PC> Chevron Paradox NDF16 > Phast Pre > Neuro. 686 > Tannoy Berkley (RFC tweaks)