2003 WRX wastegate

So i bought my car used a few months ago and took it to the local import shop for a once over. It turns out It has catless down/up pipes so the dude said next step was an adjustable wastegate. If this is true, what is a good brand that isn't gonna run me dry and will get the job done. My ultimate goal is to have the turbo building slight boost at idle so when I take of i don't have to deal with that damn turbo lag, I lose valuable seconds in surprise street races cuz of that. Also I assume if the wastegate is adjusted properly I will have more boost built when I'm goin through turns so I'll be able to whip out of them quite nicely...any suggestions at all?