If you want a fmic that you can remove before selling your car then you want the forge twintercooler.
IMO the best out of the box IC is the APR one but only if you have a manual transmission and consider it a "fit and forget" item when it comes to selling your car. The cheaper option like I said before is the oem S3 IC.
You do not have to have the IC fitted prior to your remap as the maps are, in general, made using the standard oem IC. If you choose revo and get a select plus switch then the addition of the uprated IC may allow you to run with a slightly higher timing.