trade in wise....you wont get alot off of it....
you are better off to keep the phat and buy the slim as a 2nd psp.
remember, slim doesnt have 1.5 kernal... so some homebrew wont work on slim at all. so its good to have a phat for 1.5 brew ( yes.... some things do still require and are bound to using the 1.5 kernal ) and a slim for 3.xx brew ( esspecially ones with video out)
i hope that helps with your answer.
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