You can use a <30$ Phosban reactor as a Co2 reactor.. works very well (It's what I use, same premise as most other reactors, but can hang on the back of the tank and both input and output are on the top.)
The pinpoint controller is supposed to be accurate to 2 decimal places, but who really needs that much control.. The Milwaukee unit is far more practical..
The Milwaukee reg is a good reg with all the extras you need. Most of the ones on Ebay come with free tubing, but silicone tubing is pretty cheap.
Powerheads for the reactor are also pretty cheap and is preferred since it can reduce the flow a little bit.