best mach for SB venere 1.5

"now i need to get amplification that will be most suitable for them"

It would be helpful to know what aspects of sound reproduction are most important to you as "suitable" means very different things to different people. But, without that info, I would think it would be hard to go wrong with something like the Hegel H80 as it's a good all-rounder and has the onboard DAC you're looking for. There's also a nice H70 for sale here now for $900 that would probably get you close for less than half the price and leaves room in your budget for decent cables/interconnects. I found the Acoustic Zen Silver Reference II interconnects (Silver Ref I would work too, that is if you even need interconnects) and Satori cables (you'd need to buy both used, which is the way to go anyway) to be a nice match with the Venere 2.5s. They let the detail of the tweeter come through without being at all harsh and fully communicated very real and palpable mids the speakers are capable of. I'll have to defer to others on USB cable recommendations. There are undoubtedly other (and maybe cheaper) cables that would work well too, but just wanted to throw out one recommendation from experience. You could try some cables from direct sellers (Grover Huffman, Morrow, etc.) who usually have generous trial periods and return policies so you can try at home, and they offer good value. Hope this helps and best of luck.

Djverne makes some really good points that may ultimately drive your final decision. I think your findings with the Rogue amps was revealing in that the Cronus is a fuller sounding amp while the Sphinx is voiced a little leaner. The Veneres are not a terribly difficult load -- the manufacturer told me they did this on purpose as at their price level they expect many to drive them with midfi receivers -- so I think it is this voicing difference more than a lack of "power" per se that you were hearing. My guess is the Exposure and Hegel are voiced maybe a little closer to the Cronus, so your choice may come down to whether you prefer a more visceral/driving upfront experience (Exposure) or the relatively more detailed, open, 3D presentation of the Hegel. As you're relatively new to this hobby/affliction the dimensional/depth aspects are things you might not be attuned to as much until you hear it on very good systems that are well set up in a good room -- or maybe you'll wind up not caring about those things at all as lots of audiophiles don't. Think of it as the difference between sitting in the first few rows of a performance where everything is right in front of you and very present versus sitting further back where individual sounds aren't quite as prominent but you have a better perspective or view of the entire soundstage in the context of the recording venue. I would say that if you find the Hegel and Exposure to sound very similar then go with the Hegel as down the road you may end up appreciating its added dimensional capabilities, and of course it has the DAC too. But, strive to keep that memory of the sound of the Cronus in mind as you hear the others as a triangulation approach can be very helpful in more clearly identifying important differences and ultimately making the best decision. You certainly have three very fine options thus far to choose from. Again, best of luck.

Congrats. Nice amp and great that you got to demo it. Always a good thing.