Next time, I WON'T USE Brandnames!

Well, just when I thought I was on track for my 2 niche sites I recently started, it looks like I gotta turn back around and start over. It's because I just found out that I apparently can't use company names in my domain. I thought it was fine, since I wasn't using the logo, but just looked into it and it looks like even using a name can get you in trouble. It's weird because I've seen other sites out there that use company names, sites that seem to be doing really well. I hate it cause of all of the time wasted, but even worse is that I really think I was on track for page one of Google with both sites. Better yet, one keyword had 27,000 searches a month, and the other had 165,000!

Anyways, I'm wondering about a few things now. This sounds like a dumb question, but what's the best way to take a site down? Just change nameservers? Also, is there a way to keep wordpress installed on those databases, so I can just assign the new domains to them as soon as I get those?

Here's something else. I would sure hate to loose all that work I did writing the articles for one of these sites. If I took the site down, and then put a new site up a few days from now, with those same articles, would Google penalize the new site for using that same material even though the old site would no longer exist? Or better yet, is there some way to "migrate" or "transfer" the old site, including the way the pages are set up and everything, to a new one?

Alright, I know that's a lot to ask. If anyone has any info on this, like always, it's greatly appreciated.