I would love to see Rylance's Twelfth Night/Richard III transfer- I spent a week in London last fall, and got there just as the Globe finished their season, so I missed what apparently was an incredible production.
I'd also love to see a production of Titus Andronicus anywhere, largely just because I really love that play.
I am a firm believer in serendipity- all the random pieces coming together in one wonderful moment, when suddenly you see what their purpose was all along.