Any of those management systems will work fine.
Dave Walker is very good at mapping emerald, makes perfect sense to buy one and get him to map it for you.
He did a guy I knows 20VT in his Elise and it worked very well.
Personally I really do HATE the emerald mapping software with a passion and would sooner map a car on Omex while being kicked in the shins than map anymore on Emerald as it would still be less painful, but as you dont want to touch the mapping that isnt your problem and Dave actually likes the mapping software in the context he uses it in (I tend to road map, he doesnt)
Fetaures wise, MS is king, but its also by far the most problematic too, loads and loads of different firmwares etc and can be a pain to get communicating as a result if you are a mapper and someone just turns up with one.
Most rolling roads wont touch them, I personally really like them though.
Last edited by Chip; 27-07-2011 at 02:15 PM.