I don't think I agree with several of the points you've made in the comparison btw v2 and Stealth. For instance:
1) v1/v2 more slam.... I think the v1/v2's were more about bass definition, not slam. The Stealth also has the bass definition of the v1/v2, but also more dynamics and "slam" - the Stealths can sometimes border on too much bass slam if EQ'd wrong.
2) Mids are similar....v1/v2's have more energy?... I don't think so. The v1/v2's have a "distant" type of vocal/mids. The Stealths have the ability to be intimate when called upon - the v1/v2's remain distant and sometimes hard to make out. Plus the Stealths have better timbre and texture out of the box.
3) Micro and Macro dynamics are better on the Stealth due to it's sharper imaging and dynamics. Again, the Stealths have better timbre and better texture.
4) Now to that soundstage difference......? At first listen and when brand new, Stealth staging is smaller and closer to the head. But after time to play in/burn in, they're practically the same size - but Stealth has sharper imaging which creates more layers, has better timbre, and more easily heard texture.
5) Both have excellent imaging, Stealth has sharper imaging though.
6) Dead spot in the center for imaging...? Neither the v1/v2 nor the Stealths have dead spots. Sounds can be heard near/top/bottom/left/right, far, left, right, center, center-left, center/right, center/left/up/down, center/right/up/down. The localization of sounds in all areas of the soundstage is good in the v1/v2, but phenominal in the Stealth bc of it's sharper imaging. V1/v2's can image but images are a bit fuzzier.
7) V1/V2 does Electronic music better than the Stealth.....? All three versions do electronica well, the Stealth has just as large a stage (after time to burn/play in) as the v1/v2 but the Stealths image sharper and more distinctly - creating more contrast between space and instruments and better timbre and texture. The v1/v2 images are less sharp and more fuzzy.
Not to bash anyone, those are just some points I didn't agree with - we all hear differently. I would also like to mention that ultimately how Arya sounds will depend on the rest of your chain - especially the amp, IMO. I think the Stealth is a worthy improvement of an already great HP. I'd be hard pressed to pick a definite winner in all aspects when comparing the three. The deciding factors for me was that the Stealth is still an Arya and has a common sound quality to the earlier versions, it is much easier to drive, and the fact that I could trade in my v2's for a brand new Stealth set within a reasonable dollar amount. I'd say win, win, win.