What would be a good color laser printer under $400.00 to use for a small greeting card business?

Should I take a 2400 dpi instead of 600?What would be a good color laser printer under $400.00 to use for a small greeting card business?
I have an HP color laserjet 3600 at home and it works great for printing. It prints very fast, with excellent colors, and the cartridges are very popular so they can be refilled for cheap. 2400dpi might be overkill in my opinion..