Dave Patrick Ultimate 120 is a little larger than the Goldberg, thus should be a little smoother. World Models' Ultimate 120 is in between these 2 in size, but also $400. Ideal powerplants:

Goldger Ultimate: OS 1.20
World Models Ultimate 120: Saito 1.50 / Enya 1.55 / YS 1.20
Dave Patrick Ultimate 120: Saito 1.80 / YS 1.40

I just think 4-strokes are better for these types of planes due to the throttle response, and muffler fitting. Granted, putting Saitos into DPM Ultimate requires some firewall trimming, but not as drastic as what you'll need to do to the cowl to fit a Pitt's style muffler for a large 2 stroke. Ultimate's cowl is simply too streamlined to enclose a 2 stroke's Pitt's style muffler. Then there's the sound factor.