i know mine is an s3, but im going straight to 'stage 2' as its known.
purely because, even with a stage 1 map on all standard components they get very hot, power dies, and the engine isnt AS happy as it could be.
stage 2 ticks all the boxes. IATs are in good order, power is more consistent, and EGTs are in good order at any given power/boost level.
id never have been happy with a 'stage1' generic map for all the above reasons. i'd rather the engine be as efficient and safe as is possible, stage 2 is better for these reasons.
so basically, if you do want the most out of your motor, all the supporting mods for stage 2 are a good idea.
plus, even with the bolt on mods, without the final map, the car will still feel totally different. im amazed at my car with the stage2 supporting mods.