Opinions on Esoteric clocks ......

Which clock? The Esoteric Rubidium clocks will have more of an effect than their lower-end clocks in a highly resolving system.

......The Rubidium is out of my price range - the one that is is their G03X.

All you can do is try it and see....

I have added the GOR-b between the P-03 and D-03 after more than a year using the two alone. It is really hard to say what, specifically, it does, except that when you remove it the naturalness of the sound is diminished, and even superb CDs and SACDs become excellent digital sound again, not just excellent sound. I have heard from a very reliable source that the G03x has little positive effect between the P-03 and D-03, but is a substantial step forward when used with the P-05 and D-05. If, after my own experience, I were going to get a P-05/D-05 combo for a second system, I wouldn't even consider it without an Esoteric clock, the best I could afford.

I'm in the same boat, I have a D-05 and trying to determine which clock to purchase. Here are some numbers I found researching;

Clock accuracies in ppm:
Internal Esoteric D-03 = .5 ppm
Internal Esoteric D-05 = 3 ppm

Esoteric G-03x = .1 ppm = $4,000
Esoteric G-0Rb = .00005 ppm = $15,000
Antelope Isochrone OCX = .02 ppm = $1,495
Antelope Isochrone Trinity = .001 ppm = $4,750
add Antelope Isochrone 10M to the OCX or Trinity = .00003ppm = add $6,495 to either clock

Prices are MSRP

If it's all about ppm and $$$'s, I was considering the Isochrone OCX, but if power supply etc.. play a major role maybe the G-03x.

decisions....decisions...