well nacho cheese is usually a bit more at most places if you want that with your chips.. j/k
well it also depends on your mods. I would say around $250 - $300. Some chips charge maybe $50 more if you have some sort of cam (I dont know if there is a popular cam swap from M20's like us e36 guys do with the e36 m3 cams), or also a lightweight flywheel. Conforti seems to be good, but the best I would say would always be a custom tune.