I moved on from a Stageline a couple of years ago and to be honest, to beat it I had to spend more than double the money as it’s pretty damn good at it’s pricepoint. By all means try the DV and Lehmann offerings but I think you’ll need to throw more wonga at it to hear a noticeable difference. If you do then Rega’s Aria is a top performer as is Verter’s phono stage ( I have both) but you won’t get much change out of £1k.
Looked at all three options, as well as a few others and ended up with Rega Aria. Dyna P75 works well with Dyna cartridges. But I preferred the presentation from Rega Aria.
Next step up might be Naim SuperLine. This can be run from SN2. Adding separate PSU, such as HCDR, is another nice step up in time.