Looking down your list, I cannot think of any well known games you have not played, if you cannot find ANY that fit the bill, I'd either suggest that MMOs are not for you, you need to seriously find a good guild or some friends to play MMOs with, or that you should wait for the new releases (although the ones that may step outside the mould are still a way off yet).
There are some great indie MMOs out there if you go looking, depends how fussy you are about graphics, animations e.t.c.
You say you want PVP, and want to solo bosses, so why are you actually playing MMOs? There is much, much better pvp available in games like Heroes of Newerth, Starcraft 2 and any FPS. You say you want PVP, and yet turn your nose up at Darkfall, MO and EVE.
And then you say you want solo encounters, to the point where EVERTHING should be soloable? That game simply doesn't exist in the MMO universe. If you want that, your better off buying Two Worlds II or something.
To really answer your question, I need to know WHY you play MMOs, because I really can't figure it out. You don't seem to have any social ties like a guild or circle of friends, nor do you have a desire to have to encounter other people at all, so why MMOs?
Oh and also, you really need to give games more time, saying that a game got 'boring after a few hours' when it's an MMO is like looking at the main menu of a single player game and then passing judgement from there. I normally get to max level or 3 months gameplay in an MMO unless it is really so bad I cannot stomach it and then make a decision about whether I want to play it longer term. The only game I couldn't play for 3 months was FF14.
If you want a truly brilliant pvp MMO, pick up Planetside while you wait for PS2