Seif, I am at a loss on Pre-Amps in the price range that you are seeking. It has been a few years since I made a pre-amp purchase and at that point I upgraded within the Audio Research product line and had my mind set on what I was going to buy. I think before anyone here on A’gon can make recommendations, it would be helpful to know what you have now for amplification, speakers etc.
I can tell you that I had an Anthem D2v for quite a few years and sold it and bought a Marantz AV8805 recently. I am really liking it, but I only use if for surround and can’t say how it sounds in comparison to the Anthem. I will tell you that when my previous Audio Research was back at AR for repairs, I used the Anthem for stereo and was not happy with it by comparison. And from what I have been able to tell on the Marantz is that it is warmer in sound and less complicated to navigate. But I have to take in to consideration that there is at least 10 years in technology evolution involved. I was going to buy the AVM60 but it doesn’t have 6 channel analog inputs and that is why I settled on the Marantz.
But if you are looking at new in the 4K price range for 2 channel, I might suggest Marantz, Parasound, Bryston has a unit at 4500 that you may be able to negotiate to 4K. I am sure there are others.
If you are thinking 4K used, then the Ayre, McIntosh, Audio Research etc.
You have some research to do, and as mentioned it might help garner more advice with a list of involved equipment
Good Luck
Theo