What to upgrade first

Another vote for turntable/cartridge/phono pre upgrade.

improve your front end, turntable, cartridge, phono preamp.

Thanks everyone for your suggestions I do like the sound of manepan speakers and when I upgrade it will be to 1.7 or 3.5 Or 3.6.

Any other suggestions on phono pre and turntable that are good performance price ration also considering used equipment.

Does the upgrade From m-150 to m-180 make such an improvement in sound the upgrade is about $1495 when I checked.

There was a Pro-ject tube phono box II in black for sale here a couple of days ago for $350. Not sure how you can track down the seller if it is still for sale. I really like mine, which sounds better than the Vincent Pho-8 and Musical Fidelity V-LPS.

I also really like my Pro-ject Xpression III TT with Ortofon MC-3 turbo cartridge. The RP3 and Traveler are getting very good reviews also.

For interconnects, you can get a big improvement for not much money. I could not believe the performance of my Mogami cables that Pro Audio LA built for me (not affiliated) for $24 a 3 foot pair at Pro Audio LA - Mogami 2549. I had them float the ground on one end to make them "shotgun" directional. I also use Mogami's speaker wire (see my system page).

I went through the same thought process about what component to upgrade. I'm my case I had a sense my QUAD 22L2 speakers were the weak link versus Monarchy amps, and N.E.W. P3 (Cary made) tube preamp.
A friend of a friend built me a pair of custom speakers. He used the drivers from the 8571 speaker. He modified the tweeter and built a much better crossover using Hovland caps, exotic inductors versus the stock crossover. Bottom line is that for less than $2k I brought the performance of my system up considerably. I don't think any amp, preamp swap running through the QUAD speakers would have offered the same performance improvement.
Best wishes!!!