Pick on? And this coming from the guy who likes to call people fags for fun. Seriously.
I'm actually giving you good advice. You're talking about only two headphones, not like you're trying to narrow things down from a list of ten. You know about both the HD800s and K7000s enough to have short-listed them, which means you've already read enough about them to have done that. Starting a thread asking for "tips" from users either tells me that you needs to learn how to read better, or that you're lazy and want others to spoon feed you. You said would buy from a store, which means you can probably listen to them. These are high-end, and rather expensive headphones. It is truly stupid to not just go and do that if you're trying to decide for yourself.
I'm also going to suggest you not be a whiny asshole here. You're exactly one whiny asshole post away from us not wanting you around here either, at least not having to read your posts. Re-read your welcome pm, this time with your comprehension hat on.