yeh security, nice mods on the budget.
should be the goods.
i have personally installed and driven an rb20 with the kkr480 turbo form ottomotto in sydney.
had pfc,550cc injectors, z32, turbo back exhaust, front mount, cam gears, catch can, running 16psi and it pulled 254rwkw out of an unopened rb20. next will be cams, should see 280rwkw.
as for suspension and brake upgrades, gtr brakes would be a cheap but highly effective upgrade.
suspension wise, nice set of bilsteins or coilovers would be nice, fat sway bars and sturt braces front an rear would help it handle alot better being a 4door. personally i would go coiloivers, with height and damper adjustments, so you can raise the height for drag and soften it up, let your pressures down to 20psi give or take 5psi so your launch is taken by the car and wont bounce/wheelspin.
my mate has spent $5900 so far, and i helped him install it. ran 12.6 with a slipping clutch.
next he is to upgrade his clutch, do the cams, hopefully touch the high 11's.
turbo is a little laggy though, so the cams should help this and a re-tune.
best of luck with your mods mate. look forward to seeing your results.