I don't think the Stepperworld board will perform as well as the HobbyCNC. The HobbyCNC and the Xylotex are somewhat comparable, although the HobbyCNC can use higher voltages and probably offers a little better performance. Both the HobbyCNC and Xylotex probably work best with motors in the 300oz or less range.
What voltage are you running the HobbyCNC at? Is it the Chopper board, or the older style they used to sell?
The only realistic option for that 1200 oz motor would be a Gecko 201 or 202.