First Welcome to the way of life (uugh I mean hobby).
As for chillers there are a few options one you can build or buy a counterflow or Immersion chiller. Not very difficult and fun projects if you have any mechanical abilities at all.
However, since you want Plate Chiller there are a few ways to go....
A forum vendor (We like to support these guys) KegCowboy
has them in various sizes and in some cases better prices than Duda Diesel but won't have them again until December
If you want one NOW you can check out..
Both should have what you are looking for and be cheaper than the Shirron that you are looking at