Turbo Timer - 99% useless on a WRX, they are only used on oil cooled only turbo's. Ours are oil and water and need no time to cool off after a hard drive.
SSQV BOV - You'll find out soon enough
Catless Downpipe - You got one right!
Up Pipe - Also not much use on 06+ WRX's. IMO unless you plan to go EWG don't touch the stock up pipe.
In all reality, return the turbo timer, return the bov, return the up pipe.
With that cash you can buy the following (I'd say $700):
3-Port BCS ($100)
Some sort of intake ($150-200)
Tune ($350+) please don't run the car with that downpipe and not tuned, you need to at least get it tuned if you like your car.
Just being honest, next time do more research before spending all that money on things that make no difference, and in fact can reduce performance.
As for the bbk, don't waste your money. Get better pads, rotors, lines, and fluid and you'll stop shorter than any STI with stock brembo's. A set of stickier tires will honestly improve your braking better than a bbk as well.
Don't waste your money on a radiator. Stock is more than enough to cool what the stock turbo can do. If anything get a lower degree thermostat.
Intercooler, do it. Don't bother with mishimoto though, they only make cores. You would have to get piping made for the car as well as a way to mount the intercooler. After all that you'll probably spend more than the going price for most intercooler kits made for the WRX.
Read this: http://forums.nasioc.com/forums/showthread.php?t=533787
follow it religiously.