I am considering buying a domain for a micro niche blog, and it is going to have the domain "ipad" in it.

Would it be safe to buy it? I won't be attempting to show that I own the iPad, if anything, I will blatantly be saying that I my site is completely unrelated.

I also noticed that if you look under Google's keyword tool and Micro Niche Finder, there are almost no keyword results with "ipad" in them. Is this because of the trademark, or the lack of popularity?