Fullrange Speaker for Quicksilver Silver 70's

You may want to consider the Gallo Ref 3.1's. I use a pair of Quicksilver Silver 60's to drive them and they sound wonderful together. They are generally available used for $200 or less.

$2000 or less.

I have those amps and used them with spendor S8E's with great results,I now have them mated with spendor SA1's only because I like a smaller type speaker in my room and they go great together.I use el34 tubes in my amps not kt88's.Check out spendor,years ago I had vanderseen 2's and 3's placement was always a problem so the dealer recommended spendor so this is my brand of choice.
GOOD LUCK

Coral
I forgot to mention Silverline since you mentioned the Coincident line.They are really easy to drive.But you have a lot of power on tap and no ability for triode so maybe it's a waste.But if you could spend what the amp cost there is a used pair up for around $3500 for $8K Total Eclipse which got great reviews (but they are very deep).If you had triode switch I'd try to here both of those lines as they have really easy loads.But still might be your cup of tea since they can handle a lot of power.That's nice in speaker (Zu,Silverline,Coincident) that they combine low power options AND high power.Looking to change from from my German horns and want T power or SET option so I might try to find Coincident dealer myself even if I would probably buy used.
Chazz

You may find auditioning Coincidents a tough run. They are as a rule very bright fast and if you will audiophilish. However if you you want the best sound from a pure SET topology, there aren't a lot of speakers that toe the impedance line above 10 Ohms like Coincidents do.Except Vintage stuff I guess. Your horns and some single drivers.