I only had room for one. I went for something where wizard wasnt easily achievable in my price range. Wound up with JM. I think a lot of folks are saying LOTR. I used to think that was the answer too because Valinor is damn near impossible. Aside from Valinor, youre looking at 40 minute game times constantly trying to achieve the impossible. If you want that challenge, this is the pin, but it will beat you down to the point where you hate it. Playing for an hour and winding up just short will eat at you. You will start to despise Gimli's bitch ass. Judging by the way you move games in and out, I think youd get sick of it.
I think the answer is there is no perfect game for a one game setup for someone who loves to play daily. You WILL get tired of it. But if youre someone that NEEDS to achieve the Super Wizard Mode, yes, TSPP and LOTR are the games as they will take the most time to get there.