I'm not quite sure bout dual processors, normally I would say yes, since a renderfarms uses a network to render out. Netwerkrendering becomes interisting when you have several frames. I wouldn't make any further costs on dual processors, since it's rather expensive. I would just make sure to have 2 64bit pc's if costs isn't a direct problem. But beware of the graphical card you use. Normal game cards are not the best cards to model on. But those cards are really expensive. I wouldn't go useless high in costs again here. First play with it, and if you feel necessarely to get a second pc, buy one. You can still render on nights when not working. 3dsMax even offers a tool to get you updated on frames which are rendered (via e-mail) Photoshop isn't that hard referring to 3d animation creations... So if it works for 3d it definatly will work for 2d!