I have 1.6's and have driven them with 4 different amplifiers and gotten excellent results. They are as follows: Bryston 3BST, Audio Research 150.2 (Tripath), Quicksilver V4 (Mono Bloc Tube) and Red Dragon M500 (Mono Bloc Class D). Presently switching back and forth between the ARC and Quickies using Audible Illusions M3A Tube Preamp. I used the Bryston with the same preamp as well and the sound was incredible with all 3 amps with this preamp but sonically a bit different. I'm now using the Bryston on a pair of Vandersteen 3A Sigs and it's a great combo as well. The Red Dragons do need a preamp that can play nice with an input impedance of 10k. That's a little low for a tube preamp but you can try and see. When I used the Dragons I used an ARC SP16 but with SCE HRS interface that helps with Amp to Preamp impedance issues. I have not tried the Dragons with my AI M3A yet but I intend to at some point. The Bryston, ARC and RD amps are older products and may be found used at a bargain price. The Quickies are still in production and have gotten a little pricey but you may be able to find a used pair within your budget. I would imagine the 1.7's at least would be in line with the 1.6's in terms of mating them with amps.
