Geo has been recommended to me by another person too. The schuran I have been told is awesome, but hard to find parts, and if you do, they are expensive.
The only reason I was considering a precision marine model is that my lfs uses this on their new 300 gal display tank. The coral growth is spectacular! But they just seem a little cheap from just looking at them. Korallin was recommended by marinedepot and a few others, since they are widely used in Germany, and have been for years. Guess it is a choice between the Geo and Korallin.