I think the reason that the question posed by Dr. Porsche has elicited so many disparate responses (and arguments with nattering nabobs of negativism) is that the question calls for subjective opinions; we all have one. I have always had the "feeling" that there is a point of diminishing returns when it comes to all or any type of audio gear, but I have no idea where that point lies. I don't think any of us have an answer that is generalizable to everyone else. This dilemma has made a cheapskate out of me, most of the time, and induced me to become a DIY tinkerer and builder. I do know what capacitors and resistors I prefer, but I could not and would not dare tell anyone else where he or she should stop spending money on a turntable. For me, the "answer" is either my SP10 Mk3 turntable, heavily tweaked in a custom 100-lb slate and cherrywood plinth, in which my net investment is around $8K or my Kenwood L07D, restored to OEM operating condition, at an investment of about $3800. But others who prefer belt-drive turntables would scoff at those choices and those valuations, preferring instead some modern $50K piece. I don't take issue with that. This is a fun hobby. I've heard the Walker turntable in its earlier iterations, and it is indeed superb, best sounding belt-drive I ever heard, but I am happy with what I've got.
So, Porsche baby, perhaps you should re-phrase your question or else take the responses that appeal to you the most and go for it. (In my lifetime, I owned just about every model of 356 Porsche ever made, up to and including a Carrera GT Speedster, and then a 550RS Spyder.)