Makes sense
In this case, while it’s a bit above your 5k mark, if you wanted something with tubes a lampizator Baltic 3 makes good sense to me. I do think it will be more neutral and less sweet than the abbas, but I’d not call it clinical or aggressive, and it is vocal forward as well. It can be changed depending on the tube swaps. If you did want something sweeter and more relaxed from lampi you could try and find a used golden Atlantic or Atlantic trp imo (which honestly might be a better value depending on how much they go for).
I also feel compelled to mention a totaldac d1 core because it’s warmer more relaxed lean would likely fit really well into your setup, it’s very organic while being pretty dang technical to, strikes a really good balance there, and spatially has a larger and more grand presentation imo
Another option I’d definitely want to mention is a mojo mystique dac, if you could find a mystique evo b4b I think it’s a great option for a very warm, fun, and organic pick.
If you wanted something a bit more neutral relaxed on the softer and more nuanced side of things, am aqua la voce s3 might mesh pretty well into your setup imo although I don’t think it will add as much flavor into the setup as the first 3 imo.
A few other options to potentially consider might be a merason dac-1 (good balance between sweetness and technicalities), msb analog dac (warmer and richer focus overall), or a meitner ma-1 v2 (warmer neutral, smoother, more micro focused)
If you’re interested in any of these I can go into more depth for a comparison, I don’t really think you could go wrong with most options at this range honestly
You’ve already got a good digital source covered with the audiobyte so you probably don’t have to worry about that here
I can’t really offer comparisons to the abbas, and I don’t really know the performance level of the abbas either so I’d assume these would be an upgrade from the technical level of the abbas, but I really don’t know.