Congrats on doing so well your first year. I was in the same position as you. I did my first year at a t4, finished 2nd in my class and transfered to a t1. I struggled a bit with the decision considering I lost law review, moot court and a scholarship.
I am happy I transferred. All of the big shot "local" firms that I had dreamed of working for during my first year called me back for interviews, even though I was no longer in the same state as those firms. I turned down all of their call-backs for a job at a vault top 20, where I am summering now. Even though I was top of my class at the t4, I would not have had the chance to interview at this firm. Losing law review didn't seem to make much of a difference to employers, and now I will have a great school on my resume rather than one that provokes the question, "Oh, they have a law school?"
Again, congratulations. Either way, you're in a great position.