Show us the $$$
Take it from someone who is going to be laying out $5000+ for a Kenne Bell blower soon, removing expensive aftermarket bolt-ons to make room for new ones is a drag.
In general terms, a build budget might go something like this:
1. Au Naturale (na)
Stage 1: Basic list with Lots of bolt-ons - tb & plenum ($370) - cai ($200) - 4.10 gears ($600) - long tube headers & xpipe with cats & after cat system ($1900) - steeda tri-ax ($180) - SCT or Diablo tuner ($375) - Sport springs ($300)... Total of $3625 (incl labor, assuming you install the triax, tb and plenum and do the tune yourself) ...maybe 280rwhp at the end of the day.
Stage 2: Motor time - VT or Comp Cams with new springs, CNC Port/polish heads at the same time ($3000) - Dyno time ($300) Total of $6925 so far ...maybe 330rwhp now.
Stage 3: Alternative motor time - do the cams and heads, then stroke the block to 5.0 with forged parts ($5500) - Dyno ($300) Total of $9125 ...maybe 400rwhp.
2. Centrifugal supercharger
Stage 1: Kit without intercooler ($3500 with labor and a few extra parts) - dyno time ($400) Total of $3900 ...maybe 6psi ...maybe 300 rwhp.
Stage 2: Add all the na Stage 1 items that match (cai, plenum, tuner, etc.), but the tb will help, as will the exhaust (more efficient for the sc than the na), and you've got to have the springs and triax, and 3.73 gears regardless... ($2900) Total of $6800 so far.
Stage 3: Add that intercooler you KNEW you'd want eventually ($1500) - plus a smaller pulley setup ($120) - larger fuel injectors ($300) - larger fuel pump ($300) - more dyno time ($300) Total of $8320. ...maybe 420rwhp or a bit more.
3. Twin Screw supercharger
Stage 1: Kit without intercooler ($4000 with labor) - dyno time ($400) Total of $4400
...maybe 6psi ...maybe 300rwhp.
Stage 2: Add all the na Stage 1 items that match, etc, etc., with 3.55 gears... ($2900)
Total of $7300 so far.
Stage 3: Add that intercooler ($1500) you KNEW you'd... etc, etc, kit is more complete, so you don't have to add fuel injectors, extra pulley and fuel pump, but more dyno time ($300) for sure... Total of $9100. ....maybe 420rwhp or a bit more.
VERY loose estimates, but big bucks for big power. You choose.