hello there first off i wouldnt say left for dead is low end but whatever to at least run photoshop smoothly i would recommend at least a laptop with 8gb of ram and a core I7 you might be able to get a laptop with a core I5 and get photoshop to run well also with that in mind a core I7 with hd graphics 4000 could probably run left 4 dead on medium to low settings but the tradeoff here is you will have to more than 300$ to get a laptop with a core I7 and 8gb of ram i looked on newegg.com and they have only refurbished core I5 models in your price range of 200-300$ here is a laptop i would recommend
http://www.microcenter.com/product/437400/G50_156_Laptop_Computer_-_Black
it is more than your budget but i can seem to only find refurbs in your budget this one is just a tad over your budget and you will need to upgrade the memory to at least 8gb yourself to get photoshop to run properly anf that one is a new laptop not a refurb if you can save some money you might take a look at this
http://www.microcenter.com/product/434555/Satellite_S55-B5289_156_Laptop_Computer_-_Brushed_Aluminum_Finish_in_Satin_Gold
hope all this info helps