The best solution is to pick a company you wont have to leave.
There are some fairly sick, twisted companies out there, who will claim ownership over your data and launch another copy of your site after you leave with ads...
So be careful who you sign up with.
And also, it's worth noting that many web servers today are very easily hacked. They don't use PHPSuExec, so you can basically access any files you want in the system, especially if they have 777 permissions. (A huge no no.)
If you're paranoid, make a self destruct sequence that only you can launch, and build it into every page. Hide it well. If you do it right, any theives will not get far with your code. Of course that's a liability if you don't secure it well.
And stealing text, well you can't do anything about it before the fact, except maybe put part of your text as images, which will be annoying to your visitors who have to wait for that to load. There is a site copyscape.com to detect it after, so you at least know who took it.
Chances are nobody cares as much as you think they might. (Unless they can get money somehow through your data. Then they care.)