I would suggest picking up a C88+, an ArTainium inkset and ICC profile, and a simple mug wrap to start with. Unless you are planning on making large numbers of mugs, it's really hard to justify the cost of the mug press when a rubber mug wrap and a toaster oven will produce the same results for the occasional short run order.
I like Cactus mugs. They have a traditional coffee mug size and shape and the coating is very high quality.
*EDIT* Oh, and you will need a decent carrier paper to print onto. Personally I use Truepix Classic, but I don't believe the brand of paper makes a whole lot of difference when sublimating (it's only responsibility is to carry the ink from the printer to the substrate).