help guide a vinyl newbie


I am just getting back into vinyl for the first time since college and could use some expertise from this knowledgeable group.

My current setup:
McIntosh 275 Mk IV
ARC LS 5 Mk II
SF Cremona Auditors
Black Cube SE
Denon DP47F
Ayre CX7

I am going to be upgrading my turntable and phono preamp over the next couple of years, but as I am hoping to “do it right once”, I can not afford to do it all at one time. So my question is: should I upgrade the TT and cartridge first and then the phono preamp or vice versa?

Since it will be a couple of years between purchases, I am hoping to gain the biggest upgrade in sound first.

I am planning to buy the ARC PH7, Rega P9 and a cartridge to be determined later respectively if that helps.

Thanks in advance for the advice!
annika
did not compare on my system but read reviews here and elsewhere and spoke to an audiogon dealer, an honest guy who felt you do get more from the ph7 but not dramatically so much more as to justify price
Its largely a matter of taste but I think the Denon stomps an lp12 (ive had both) A great phono pre will really pay back great listening dividends and your system can evolve around it.
"the Denon stomps an lp12"

Say what you will, but I can almost guarantee that your LP12 was not set up right. Please.
I'm super satisfied about a lighly modified Technics SL1210 MKII
With few modification this cheapo TT becomes fantastic