The problem with looking for a cheap junkyard turbo for our cars is that most are either too small or too big. The powerstroke ford turbo are really big and require a special bracket to be able to feed the oil. Most Holset's are too small unless you get like a HX50 or 55 but those are expensive and you can get a much better turbo. There are many different size H1C's but they are just about the same size as a HX35. I am going to be running a single HX35 on my car DESPITE everyone saying it is too small, i am only looking to make 300hp.
I agree with the question asked before that you spent all that money on the motor but you wanna spend a couple hundred bucks for a turbo?
What I would do if you must have a cheap turbo is keep an eye out on ebay and http://www.cumminsforum.com/
classifieds, lots of people selling off there old turbos because they upgraded.
Your best bet would be to find a H1E turbo which is extremley hard to find, it is essentially a HX40 which is a little easier to find. But both are pretty pricey as far as a JY turbo goes.
Again if you are set on getting a JY turbo what I would do is find a HX35 in good condition, you can find them for 200-300 on ebay and that forum I said. Get it rebuilt if it needs be, and upgrade the hot and cold side on it. Most Holset turbos comes with really really small exhaust housings, most HX35's come with 12cm^2 housings.
Go to this site.
and get a 16cm^2 non wastegated housing so you can use an external wastegate
then go here
and get the stage 3 compressor upgrade. You will need to have it machined by a shop to make it work though, should cost more than a 100.
After you do that you will have a HX35/40 hybrid, which should support the amount HP you want to make, but even then for the motor you have I still think that would be too small.
The good thing about the hybrid is you dont have to spend all the money at once, you can do it slowly, but you will still be spending more than 600 total in turbo and parts. With the motor you have I just cannot see someone throwing a junkyard turbo on it.
I would go with a MP t70 from Brian at B&G for $575 and be done with it. Then just make a DIY kit.