Thanks for your input guys.
I obviously have thought a lot about the getting the II, and I probably would have already if I could. I'm basically just looking for an awesome Mark IV / V rhythm and lead tone, not so much the versatility. What I've been doing lately is to use Ozone tone matching, but instead of creating a custom IR I've just used stock cabs, and tried to apply as much as possible from the EQ curve that Ozone gives me using EQs and filters in the axe. This is getting me pretty close tone wise, but still there are some elements missing which I can't really point out. The only way I can describe is that there's something with the gain and dynamics of the amp block and the feel that isn't quite right for me.
I've seen a lot of people here say that it's so easy to get a good tone with just a very basic setup of amp - cab and basic amp settings. That's never worked for me. So I end up tweaking instead of playing. Maybe my ears are too fussy because often when I'm quite happy with a tone tone, then suddenly the next day I think it sounds horrible and I go back to tweaking again. I still might go for the II though, once I can. I just wonder if since it's more of a dynamics and feel thing, the solution for me might something else. I have very little experience with real amps, so I'm not sure it would help either way.
And by the way, I'm basically just playing at home, recording direct into my Saffire 6 audio interface and monitoring through KRK 6s.