Hi im a long time lurker first time poster i was just wondering how much i should sell my imac 21.5 model for i spent around $1.5k on upgrades from the apple website when i bought it like putting a 1tb HDD and a ATI Radeon HD 4670 card in it. Should i sell it for more if i havent used it much because i only used it like 6 times and i never found a use for it.