You can spend $20 000 on upgrading the power of the GTI and it will still be slower than the R ...... anybody who thinks different is just fooling themselves. Common to underestimate the value of AWD in a turbo car .....
GTI has the new TSI engine .... R has the old TFSI as in the S3/TTS/Pirelli, they are actually completely different engines now. I have no idea when a 200kw TSI version will be available .... I'd say keep an eye on Audi to see when a new top of the range TSI engine comes out.