tilt shift lens for nex 7 to straighten verticals

Hi Again,

I am hoping to purchase the NEX 7 soon principally to shoot architecture.

I would prefer to shoot verticals straight in camera if I can , rather than use software -

as part of the image quality must be lost by stretching the picture.

I would be very grateful for any advice on a suitable tilt shift lens (or other) which would achieve this result on NEX 7

Thanks in advance

Chris