How much difference will a phono stage upgrade make?


For the past couple of years I’ve slowly been upgrading my audio equipment. I currently have a Primaluna Dialogue Premium HP integrated amplifier, an EAT C-Sharp TT with an Ortofon Quintet Black MC cartridge, and Tannoy Revolution XT 8F speakers. The weak link at this point, it would seem, is my phono stage, which is a Pro-Ject Tube Box DS. All things considered, my system sounds really good to my ears, but I can’t help but wonder what a phono stage upgrade would bring to the table. I’m looking at the Manley Chinook Special Edition MK II, which is a big step up in terms of cost, but I wonder how much better it will actually sound. Has anybody made a similar upgrade, and was there a marked uptick in sound quality?
12hz
Now, to answer your question, we could probably agree (or not) that Herron could be better in some systems, and Chinook in others.  But, the Herron costs double.  So, for me, moving up from $800 Jolida to $2500 (retail) Chinook, I don't see a reason to go up to almost $4k for the minimal difference in sound quality.  For another $1500, I'd expect to be blown away, and I
wasn't.

@soundermn:
Thanks so much for that detailed input. My thoughts exactly in terms of the jump in price to the Herron. It gets to the heart of my original post—I want to be blown away if I’m spending this much money on a component. I’m feeling more confident now about making this purchase and what it will yield in terms of a step-up in sound quality. 
mmai -  Thanks so much for the info. I talked with Glenn at Aesthetix and he gave some tube ideas so I rolled out of the ElectroHarmonix and Sovteks. Ive got NOS Telefunken in the phono stage now. Lush sound, but alot of rush at my listening levels. But I have no point of reference. So your info is helpful. I could probably live with rush at the level you’re describing. For no particular reason, I haven’t tried Gold Lions but I definitely will. I’m all for a solution under $8,000 - so I can get that Lyra cartridge instead!!
I have Dialogue HP INT also.I would never use a tube phono stage. (YMMV haha!)
Many people who should know say tubed phono = too much distortion.You don’t want my suggestion, but Sutherland 20/20 w/ PL Dialogue HP sounds pretty fine IMO.
I would disagree with Leotis on this one.  Sure, there is some small amount of distortion that tubes MAY add, but it's negligible.  You'll see that Kevin Deal highly recommends the Chinook with the Primaluna as a good match.  My experience is the same.  I moved from 2 different SS phono stages (Musical Fidelity and PhonoBox RS), both good in their own right.  And I find the Chinook betters both by a long shot.

Also, above I didn't mention that I use an ART9 cartridge.  I do find a tiny bit more gain would be good.  And, the latest version delivers an extra 5 db of gain.  I sent mine in to have that added so I can try it out.  I don't want to add an SUT to the mix.
 You'll see that Kevin Deal highly recommends the Chinook with the Primaluna as a good match.

Kevin Deal is a tube dealer, what else he can recommend? 
He also a dealer of Manley Lab. gear. 

Gold Note PH-10 is a new generation of SS phono stages
JLTi is also superb SS phono stage for MM/MC 
both very reasonably priced