Regarding monitoring, I don’t recommend any specific speakers, but I would *always* recommend spending a third of the budget (and some time) on room acoustic treatment. It’s nowhere near as sexy, and can be frustrating as well as time-consuming, but it is a thousand times more important. And when you fix your room, you realise your old speakers aren’t as bad as you thought. Put it this way, the average home studio nearfield is +/-1 or 2dB or so across its range. The average room in which people put those monitors is +/-20 to 25dB (yes, twenty-five). And that’s just frequency response, which is kind of a secondary thing. Fixing the time domain is more important, easier, will fix a lot of the freq response problems, and
will blow your mind when you do it.
If you already have half-decent nearfields, my advice would be to stop chasing equipment and spend money on your acoustics. Take the time to learn how to fix the major issues and you’ll think you bought new monitors worth 10x your budget.