Analog upgrade advice.

I have a friend who had the Rega 5. The power supply and the Groovetracer bearing & subplatter upgrade took the performance to a point where it sounded better than the more expensive P7.

Really liking my new Salience Jasmine LP 2mkII phono preamp. Very noticeable upgrade compared to my Pro-ject phono tube box II and I bet your phono stage also.

Well Tempered "Amadeus" ($2850 NEW)
Van Den Hul "Colibri Gold LW" ($1500 Audiogon)
Einstein "The Turntable's Choise" ($2600 Audiogon)

IMHO the RB700 is one of the best bang for the buck I've ever encountered...I have the same amp as you and I am very impressed with the built-in phono stage...in my opinion you should get into MC cart (plug into the Luxman) and keep the rest as is until that is done...start with a DL-103R and go from there...next steps would be 'under slung heavyweight' for the tone arm and upgrade body for the cart (alu or wood...)...GOOD LUCK!

If you are sticking with the Rega or a Rega geometry, you might want to look into the Audiomods arms. It was a big improvement over the RB301 I had, and I have read follks saying they prefer it over the RB700 (on Vinyl Engine maybe?).