$300 to $500k wont go far in downtown Denver, or the close to downtown residential areas (Capital Hill, Wash Park, Cherry Creek, etc). The suburbs vary based on location, but the price range is doable, especially the farther out you get.

It is pedestrian friendly, though the city has gone downhill a bit in the last 15 years. More homeless panhandling, and the pot law has attracted young homeless (by choice) kids.