if you want a bargain printer to get started, fj50's and fj52's are fantastic printers (print with free rips too). they are slow. but i highly recommend starting slow and cheap. there are so many more challenges other than just "printing" such as learning about color, file work, marketing, design, laminating, materials, etc. the printer in the beginning will not run very often when getting the rest of the stuff squared away. let a business justify a faster machine.
dx2 heads are below $200 US. dx4 heads are around $785 US. for heating, silicone heating blankets? heat cords used for plastic fabrication? the lamp seemed to be working fine on the video, but what kind of printer was it? water based or solvent?