Think of going Turbo on my S50 input needed

[BMW_TUNER]

So here is the long and short of it. My Little red car needs to become more angry. It does have a nice fresh S50 in it but I also live at nearly 5000ft. so it suffers. I am thnking that a simple turbo setup would be an economical solution to me need for insane performance. Here is what I have figured out so far.

Tuning-Miller War All the way $1100 with maf and injectors
Head gasket/Studs- From VAC- $450 for .140 that is quality
Manifold- I preffer top mount for ease of use but if bottom is better I am listening. I like the Good N Tight Manifold. so that is $500

Now for everything else I turn to you I have read a fair bit but I am trying to determine pricing on all the other pieces and also draw on the knowledge and experience of this FI comunity.

Turbo ( I am looking to make 400-450 whp without insane lag)
If there is a cheap solution I would rather pay a little more for the right turbo than buy two cheap ones.
Input needed in this area as well big time.

Waste Gate- Brand and Price

Intercooler- Size layout brand and Price

I can easily tie into my custom exhaust so the down pipe should not be a problem. I can also fab most of intercooler piping or have it done local so that should keep cost down.

I know this is a lot to ask but if you have any knowledge with regards to my questiosn please help me make my E30 a serial killer at Altitude

[The Humjet]

A Garrett gt35r is the turbo most of the guys on bimmerforums are using along with Brett who is someone you may of heard about or seen on YouTube Driving a e30 turbo m52 with an m3 wide bodykit. Known as "turbo 325ii" who can be found on e30tech and bimmerforums.
Wastegate you can use a tial 38mm or 44mm will be enough. Don't get eBay they will break cause overboost issues and destroy your motor.
Intercooler and pipes are usually purchased on eBay. There's nothing wrong with them.

[BMW_TUNER]

Good info thanks.

[Good & Tight]

GT35R like Humjet suggested, 44mm wastegate. "turbo325ii" is making 500+rwhp on a M52 with S52 cams on pump gas, using my manifold. Don't even bother with the bottom mount, you'll need to notch the sub frame, oil scavenge pump, intercooler piping is a pain, flows terrible.