okay... so first i thought... WHAT! cut your negatives, but if you do have the money to blow on stuff like that (i don't)... but if you DO and if I did.. i would totally buy the 6x7... which would also accomodate 6x6 if you also have the money to switch!... I also agree that it would be so awesome to see those negatives on a projector..
** lots of goodwills and salvation armies.. are getting old photo equipment like projectors, although some are smartening up (goodwill now has an auctions site)... some go so far as to throw away film equipment on ground of no one wants it... IF no one at the shop does any research, you might be so lucky as to find a projector for maybe as little as you can imagine...
Get the numbers of these places online, and start calling... or visiting. trust me... $1000 bucks is a lot to spend (for me)... so some money saved, with some time invested, might be worth it.