>>Steem is probably the slowest ST emu but you should be able to get up to 16Mhz with that set up I would have thought.
Yes, I can go a tad further even.
>>>>As for colours, there is no program that can run on an ST that can use more than 16 colours, so there isn't a great point allowing more.
Come on, that isnt true! - many GEM Programs could, and would use more colours if they were available! - I am thinking of Image viewers as a very obvious choice here such as GEMview or Image Copy. then of course you have Ease or Jinnee that would definitely benefit from more colours being available... All of these run on the ST
>>>>At the moment we want to create an emulator that can run any STE program the same was as an STE would.
Ok, fair comment, I cannot argue anything about that and so you dont need anything like graphics/colours/speed etc other than to perfect what you already have.