VPI Cartridge People: What next?

I own a VPI Classic "2.7" (Classic 1/2 plinth with Classic 3 stainless steel tonearm and base).  I've been there and done it with a number of other cartridge brands and settled on the Lyra Kleos. 

I'll echo what a few have posted--if you are happy with the XX2 why make a change? Unless mistreated that cartridge should give you many years of service. If you are looking for a change what sonic attributes are you seeking? That may help guide the contributions. That said, I recently installed an ART 9 in my Scout and am quite shocked at the performance of this cartridge. I've run four different Dynas (20XH, 20XM, 20XL and XX2MkII) each was fine in their own way and a good match for the JMW9. More recently I ran an AT OC9MLII which was surprisingly good for the money--better, in my view, than all the Dyna's but perhaps the XX2MkII and also well suited to your arm. The ART 9 is remarkably refined and even handed, very neutral, spacious and dynamic. More than any of the other cartridges it just sings without imparting any signature of its own. An extraordinary buy and certainly worth your consideration should you wish to replace the XXIIMkII. Best with your search!

Thanks to everyone for the great responses. A few people have asked "why change from the Dyna XX-2?"  Simple curiosity, mainly, as I've had the Dyna cartridges for a long time and I'm interested in what else is out there + I've heard and liked (but can't afford) the top Dyna cartridges (XV-1S and Te Kaitora Rua). 

But I've also had the XX-2 installed for 4 years.  It still works fine, but I'm wondering if it's ready for a re-build.  The cart gets played every day for about 90 minutes.  I'm estimating that I've got perhaps 2000 hours on the XX-2 right now. Honestly, it's hard to know whether the cartridge has lost a step in quality when one hears it every day and the changes are bound to be quite gradual.  I'm thinking it might be time for a Soundsmith rebuild (good suggestion, Dan!) and switching to something new and interesting, cartridge-wise, that doesn't cost 5K.

I really appreciate all the advice about the AT ART 9.  This sounds really interesting, and the price is obviously excellent given all the praise I'm hearing from the discussion threads. I'd been leaning toward Lyra, based on various reviews, but the AT ART 9 idea really brings the price down substantially from what I'd expected to be paying for the quality I'm looking for.

HW: thank you for the honest advice.  I say this as a long-time VPI customer and admirer of your company.  It's hard to believe that the 3D arm brings things to a much higher level than the Classic 10.5i I'm now using (which was an upgrade from the original JMW 9 arm on my Aries). But you would know, if anyone does! I'll keep a lookout for deals on a 3D upgrade.  Maybe just a replacement 3D arm wand is the right idea?

Something no one has mentioned: possible MC phono stage upgrade.  I take it the consensus is to hold steady with the McIntosh C2300 MC tube phono stage when using something like the AT ART 9?

"Something no one has mentioned...Mcintosh C2300 tube phono stage"

I took a quick look and it appears good as anything until you're ready to split hairs/$$$ like everything else audio.
The only decision that may be an issue is choosing between the 9 or 7.
With the 7, you can save a couple more bucks, but have to get one from a Japanese seller. That, and the gain issue.
The 7  may be an even nicer sounding cart, subjectively.

For kicks, I may try one next year.