How much paper are you shredding ?
Swingline makes a ShredMaster GLX2030 Jam Free shredder, for commercial use. Cost $1400 but it’s made to last.
I don’t own one but the local insurance agent uses one.

I’m rather obsessive when it comes to shredding.

This is the nicer of the two I have: http://www.quill.com/fellowes-cross-cut-shredders/cbs/188405.html

Bear in mind that shredding on this level does not guarantee security. In fact shredded paper can attract extra attention from the baddies and document reconstruction is easier and more common than you’d think.

Consider a professional service if you believe your circumstances warrant.

I was hoping the article below would help you in your decision. I’ll leave the link in case you find information I missed:

http://en.wikipedia.org/wiki/Whitewater_%28controversy%29#Removal_of_documents