Your 5k will pay for closing costs. If you want to put money down, you should come up with some more cash.
Regarding this little debate... you asked for suggestions on things you should know. You were given that. If Fannie Mae has deemed Denver as a declining market, there's no ifs, ands, or buts around it. You'll need 5% down. I'd recommend reading that article cedski posted. That's the reading material you asked for.