As the title says im a game developer, not the one that makes games for mobile phones and flash; i mean full fledged 3d games. I use blender as my primary engine and my computer is reaching the 2 year mark and i think its time for a upgrade. I never owned a mac before so this is almost all new to me but i have built my own computer before and have good around knowlege about computers. My friend played my rpg game that i made (still is nameless) and wants me to make a mac version but the problem is i don't have a mac. I could try to use a built in program that attemps to port your game to all platforms but all the controllers would mess up because of the different keyboards so it would delete its self also there are some meshes that i would have to re edit in the mac version. He drove me to the apple store thinking i could find something that dose what i want and meet my $1200 budget and i nearly fainted after seeing the prices for just a base model 15" $1800 and thats not even after tax... also student discount is only $100 bucks off. so i decided to ether get a brand new 13" base model or this 15" i found on craigslist for $1200 late 2008 2.4 C2D. im also going to college so ill use this for work too, going to need every penny for books and supplies and paying bills. Craigslist seems a bit shady and my friends are not liking me just buying a computer that might have potential problems and void warrenties even though the seller says it's fine so would buying the 13" be fine or would i have trouble rendering and creating my games and opt for the used one? P.S. screen size dosn't bother me i could always use a external display. Also just needed to add i don't want to use credit cards/financing or billmelater cause of the horror stories i heard about them with max arp and fees.