bluebook isnt as reliable of numbers as you think, you need to look at edmunds, craigslist (multiple areas + locally) and then ebay (same as craigslist) and then go check out 1 or 2 dealers to see what they are selling for on their lots and what your trade in value is.
Takes a half a day or so depending on if you really need to visit dealers (i base it on knowledge). But it gives the the real sellable number. not the "value"