Which trim level?

Like others have said, you should decide what you want the truck for before thinking about trim. I would add that you should also really think about what kind of aesthetic you want the truck to have as well, as the TRD is quite different then SR and Limited.

Based solely on what OP has written, I question whether a Tacoma is even the right choice. If what you want is high mpg and leather seats, get the diesel Colorado.