As Gray says, Stages are irrelevant. Niki will map for the hardware you have and you will LOVE IT!!
At R-Tech, with your current mods your looking at Stage1.5 and yesa S3 IC will be fine, get that on board and your Stage2. HPFP and a RS4 FPRV for Stage2+.
Shoot me down in flames but get shot of that GFB DV and get a RevG one on, will hold boost better.