We used kayak.com to find the best flights from the New York City metro area to Denver.
We spent $267 each for a direct non-stop flight from Newark airport to Denver airport on Continental.
At Denver airport we picked up our ski-season weekly special SUV from Thrifty Rent-a-car . Most car rental places had these weekly specials for around $251 for a week. Including taxes and insurance it came out to be around $300 for the week.
We stayed in Evergreen, Colorado with a relative.