3000rpm for the K04 is misleading, i believe that 2400rpm is more correct, and as said before, doing the K04, S3 injectors and Relocating DV as step one is possible, mine makes app. 230BHP with those stand alone parts, so looking at it as step one is okay, then take the exhaust, intake and remap later when funds permits.
If i hadn't been offered a K04 when buying the car i would have been satisfied with a K03 stage 1 and a LSD, the LSD makes the biggest difference in getting the power down and the driveability of the car, it deletes most of the understeer that the car has with bigger numbers than stock