in my experience, most modern DAWs have 99% of the same features as PT, they just have a different name/location/button
if you know PT very well, it wouldn't be that much harder to learn another DAW
that being said, if you look around you can probably find a used 002 for not much more than an m-box...i saw one posted yesterday on the sweetwater classifieds for like $625, and it gives a lot more i/o possibilities than the m-box.