If you're looking to do long distance riding and don't have much experience with road bikes I would stay away from a traditional track geometry bike like the pista. Also the pista will not come with brakes so that's an extra necessity if you're looking to ride it single speed. Any of the other bikes you're interested in offer a more slack geometry suitable for longer rides. I can vouch for the MASI being a very good quality bike, so are the rest of the other bikes however I have not owned those.

If you're not familiar with bike sizing go to your bike shop where you can test any of the bikes (except for IRO) mentioned and they should help you with fitting and sizing.