Hi there - Although I've not used this type of processor, I think that a stop bath would be helpful because of the potential large amounts of dev that can carry over - with a Durst or other roller processor the exit rollers squeege the print meaning very little carry over so you can avoid the use of a stop bath.
With that in mind, I use a Durst Printo and it is an incredible machine, ofter cropping up on ebay. You only need two baths/therm units and the intro unit for RA4.
For chemicals, by far the best value kit is the Kodak dev and blix available from Firstcall Photographic - you get 4x5l - ie enough to mix 20L, but because of the separate concentrate packaging you only have to mix 5L batches at a time. The Printo uses 2.5L per bath so ideal, leaving you some to replenish with.
Matt