[MJarzabek]

Ok,

The Mbox should work with PT9. I would verify with Avid about the driver. I would recommend getting an I/O that has 8 analog outputs. MOTU makes great interfaces that are affordable an work with PT9. This way you can utilize the surround option (if you have the speakers).

If you can find a toolkit at an authorized retailer then you would get the free crossgrade to PT9. You would have the toolkit and only need to pay the upgrade price.... keep in mind the total you will spend between the toolkit and upgrade before you purchase. It may be easier and wiser to just get the CPTK2 so you have support and future upgrade options...if they come out.