Definitely the Blitz cab. As mentioned, the CP is a great size. It is also only held on to the cab with three bolts, so it easy to remove. You can put any type of cp you want on there if you want to build a custom one. Or you can just build a new top piece for it and be up and running quickly.
I have had one of these for 7 years now, and I think it is a perfect cab to use. I can't think of any cab I would trade it for. I am not sure what monitor Blitz used, but if you can get it with a 25" std res, or maybe a tri res for cheap, grab it.