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Hmm, so you could be held to ransom for your own site? I'm not saying for one minute that the company is bad or anything but the problem with this type of thing is never about how much they charge, it's about the level of service... if staff changes or they take on a bigger client, or any number of things that result in you getting low service, what are you ever going to do about it in that situation? What if the site and CMS used is no good for SEO purposes, what if they don't allow changes and don't allow others to access the source code. What if things go wrong with hosting or anything else to do with the site? I would just get the whole thing built in an open source CMS by someone and hosted somewhere you have full access to if I were you.