What should i get?

[Beny3h]

Hi some one offered me $700 dollars for my iMac its one of the earlier Aluminum models the specs are 2.4Ghz 1GB of ram 320GB hard drive it has OSX Leopard one it. I would trade that and maybe get a PowerMac G5 off of ebay or somewhere else. The PowerMac G5 would specs that i would want would be the following a i would want at least 2GHz Dual Core processor at least a 1GB of ram but i would upgrade down the road, at least a 160HD, i would also like to have OSX Leopard on it. On the computer i would be doing moderate video editing, web, email, word and powerpoint, Photoshop, light gaming, and in the somewhat near future get into some more photoshop and video editing. So would this be a good deal. the reason i want the PowerMac G5 in the because i want the expandability and for sure down the road i would want to update things on it or should i keep the iMac. Thanks you for the help.