OK guys, im moving from a total volume system of 230 to prob an estimated 500. ( display tank is 250) I am looking to spend perhaps around 600 at the moment but could go more pending what i sell to make the transfer happen. I currently have a mr2 and i know this will definitely not keep up so let me know any suggestions or sites or what you think the best bang for buck is. I know ill keep my eyes open to see if i can find a great deal on a used one but majority are for smaller systems. Thanks for the input...