The Atma MP-3 is my current daily driver. I’ve owned a number of preamps and the MP-3 is the one I like the best. I bought it used at 3.3 level and sent it back to Ralph for a checkup and to install the remote volume. He’s great to deal with and very knowledgeable. As to your need for single ended inputs, you can use both of the Tape Ins as inputs, and the XLR inputs do just fine with quality XLR to RCA adapters. No input switching on the remote, but that’s not an issue for my usage. It’s probably my last preamp.
Units I’ve really enjoyed in the past and are less expensive: Modwright LS100 (Dan is also great to work with), Don Sachs Model 2 (Don was always helpful but I believe he’s mostly retired now), Decware CSP-3 (sweet sounding but limited inputs and no remote), and lastly, the one I’ve kept as a spare for my MP-3, the LTA MZ2. It’s crazy how good it is for $1,100. I’ve never heard the MZ3 or the MicroZotl; they’re supposed to be even better, albeit for more money.
So many really good choices in your price range. Best of luck with your search!