Part two of two. While conducting research for his book Pizza — A Slice of Heaven: The Ultimate Pizza Guide and Companion, Ed Levine tried 1,000 slices of pizza in 20 cities. Some would love to follow in Levine’s footsteps, travelling in search of excellent slices, but our day jobs confine us to the Washington metro area for our pizza-sampling expeditions. Though not traditionally a mecca for pizza connoisseurs, D.C. boasts some serious pie-makers. DCist…