Question about Barns

This is a toughy... As many know, I'm right in the middle of searching for a good tractor, and thanks to the help of several people, I'm now knowledgable enough to go out and begin the footwork part of my search.

On to the next question: My barn is about to fall down (see the picture at http://whitinger.net/mybarn.jpg ) and I need to put a new one up to house my tractor and assorted equipment. I've got the spot picked out, all I need to do is find or build the right barn.

Where should I start? Should I get a metal shed, or should I build a new barn with the existing lumber from the old barn? Any pointers?

Thanks,
Dave