Reply to Audio 4DJ and music production

Was planning on buying the Audio 4DJ for use with Traktor, but wondering how that card works for making music. Thinking of trying to lay down some tracks using Reason.

Does anyone know if the Audio 4DJ would be decent for that sort of thing, or if I need and Audio 8DJ. Would using this require a separate device for a mic preamp for vocals? If there's a better card out there for if I want to do both DJing and music production?