Autornic SM4 then in my personal opinion having mapped that and all of the ones that you mention its just miles better to work with.

Contact MA Developments, not sure on exact price but I would imagine including making a loom and fitting it and mapping etc it would probably be in the 3K ballpark or so.

Or if you like DIY, I made my own loom from a cut up old one and a new plug, and got a secondhand SM4 for 900 quid, so managed it for about a grand and it only cost me 50 quid in fuel to map it