The Big Ragu,
U.S. Bank will allow you to do a 90% LTV purchase jumbo up to $500,000. However, why don't you look at doing an 80% conventional loan ($380,000) followed by a 15% 2nd lien ($71,250). This would be an EASY way to get to 95% financing by going the Conventional loan route. This should be feasible down to a 680 FICO score. You won't have to pay MI by going either route. Most 2nd lien lenders will go up to $75,000 - $100,000.
I'm sure local mortgage lenders in Denver would be jumping at the bit to do your loan based on a 80/15/5 scenario.
Maker Capital Group, LLC