Over many years, my experience has been the priority ranking is Linestage first, then Power Amp, then Phono stage. Obviously you don't want to get too far out of balance by, for example, pairing an entry level power amp with a top-of-the-line linestage, but in general the linestage seems to have the greatest impact on overall sound quality. I have had a number of phono stages and power amps that I find quite good sounding, but very few linestages that I have actually liked.
