Benny - do you intend to use it primarily for visual or photographic duties? The reason I ask is that according to Bintel, the latest f/6.3 reducers from Meade are now more designed for photographic work alone, and may not even produce a visual image worth looking at. Given this they may work better now than your older model.
More importantly, you'll want a F/R that will not vignette the STL11k 35mm chip. This alone limits your selection. Try the Lumicon GEG. I used it with the STL11k on a C11. Works ok. There are plenty of other expensive pieces of glass such as the AP reducers.