Welcome Thermit, I remember you from .classic

You can always check with infopop's hosting, you can be sure they won't run you off

v6.0.1 of threads should be out in the next day or so with lots of bugfixes, there really hasn't been any concrete announcements on 6.1 yet, tho I am sure Rick is in the planning stages...
I am not familiar with the host you asked about, you do gotta remember tho that those offering a lot for little usually are stacking their servers with lots of accounts and they aren't gonna like you bringing more load to the table

is the database size considered part of the disk amount offered?
bandwidth should be considerably less if php compression is turned on.