By Katie Kerwin McCrimmon While some states are still wrestling over whether to build their own health exchanges, Colorado is playing hurry-up offense, tackling major policy decisions including the biggest one on the horizon: how to pay for the online health insurance marketplace. Now a reality across the country as the Affordable Care Act steams toward full implementation, health exchanges are supposed to make it easier for individuals and small business owners to choose and buy health insurance plans. Some people will qualify for government subsidies to help them afford insurance while exchanges will funnel others into public health insurance…