Sold comparables are your best guide. If your agent will run a CMA without short sales and one of just short sales, then you can decide how to go. Unfortunately short sales and bank owned homes are part of the market. Often they are overpriced while active because listing agents need to try and get the top of the market to justify whatever offer eventually comes in.
Look for sold comps to provide your range and active comps to define your strategy. Best of luck.