Cat 1 is fine for your tractor. As others have said, you won't have any problem finding the implements you want/need at a better value than their Cat 2 equivalent. Beside, the 'Cat' ratings are not etched in stone. They are guides to help prevent under- or over-powering the implement in question and possibly harming the tractor at the same time.
BTW, congrats on your new tractor! As a fellow 2555 owner, I can tell you that so far, mine has been a great treat tractor. This weekend, they're predicting our first snow storm of the season will hit. It's a Nor-Easter and could dump 12-15 inches of the fluffy stuff. It looks like I will finally get to use the Mahindra with its newly installed FEL-mount Erskine snowblower!!! Woo Hoo