There's not really much of a difference in developing between 135 or 120 formats, neither is particularly difficult. I would ordinarily develop my own B&W film, but I occasionally send out some rolls to the lab for processing and scanning, especially if I have whole lot to develop—it doesn't necessarily need to be one or the other.
I think that the Autocord is easily one of the best values in photography in cost/performance terms, although there are a number of other TLRs that can produce great results, as others have already mentioned. The Mamiyas (e.g., C220, C330, etc.), Yashica Mats, Rolleicords, and Rolleiflexes are just a few of the other TLR options available. I own an Autocord and a pre-war Rolleiflex myself.
Just so you know, 120 is just the designation of the format, not a measurement (120mm would be a pretty big negative and require quite a sizeable camera!). For 35mm film, the classification is 135.
http://en.wikipedia.org/wiki/Film_format