I have a 2010 iMac base 21.5" i3 500GB model. What is the best way to sell it and how much do you think it is worth? I am thinking craigslist to avoid shipping. How much would selling it with programs like Photoshop and Rosetta Stone Spanish pre-installed add to the value if anything? (Assuming someone wants these programs) Also, what is the best way to wipe my computer and still keep these programs? Thanks.