My first Allnic pre was a used L3000 MKII and I thought it was great, it cost about the same as your Dialogue new. When I sold it for a used L7000SE I was very happy I did. It was night and day improvement. I recently sold it for a new L8000. The L8000 is better but the L7000SE was excellent at half the cost. I would never go back to the L3000MKII but could easily live with the L7000SE.
I think you will be very pleased with the improvement with the L7000.