Lightning quick DYNAMIC amp in the under $1000 range

@pkvintage : I agree! A Bryston 3B (100wpc) is hard to beat! I bought mine for $500 and a .5 preamp for another $350. Late 80's production, but sure sounds good! A great company!

I have a truly excellent amp for sale on USAudiomart or Audio Asylum in your price range

Its a lovingly used Audio Alchemy DPA-1 (175wpc)

The only reason I am selling is it doesn't produce the spl from my speakers in my large room

Search March 2016 Absolute Sound review 

I own the Newforce STA 200 mentioned by smrex13. It provides 80wpc into 8ohms, however no more than that into 4 ohms. It is highly sensitive, reaching full power with 0.65V input and has 51Kohm input impedance, making it a good choice for use with a passive. Last I saw it was being offered at $449 by Audio Advisor. 

The Schiit Saga would make for a great match with the STA200, having a low gain in passive or tube buffered mode at 1V, 0db according to Schiit.  I am considering the purchase of one myself.

Your Vandy 2Cs do not represent a difficult load for an amplifier, having a relatively benign impedance and moderate sensitivity such that they could be driven by a single ST200 in stereo mode. However if your power needs are greater (do to room and loudness levels), the vertical biamp approach is within budget. 

I also like the Odyssey amplifier mentioned by tomic601. I almost purchased one sometime back. Would work with speakers presenting a more difficult load then the STA200.
 

The input sensitivity of the Nuforce STA 200 is .45 V. Enjoy ! MrD.

I am currently running my pair of STA 200s in vertical passive biamp mode, on a pair of not well known, Signet SL 280 ex floor standers ( a sleeper of a speaker, imo ). They are a two way, and was a competitor with speakers under the $1500. price point when they came out. I do use them with a powered sub, centered between them, in a 10 x 12 room, and the system sounds awesome. I run the amps passively ( no preamp ), and feel they would do very well with the Vandy 2Cs. The biwiring option is the 1st thing to do, as the Vandys / amp will definitely " open up ". Enjoy ! MrD.