apparently you are not interested in a peer reviewed white paper
first ebay ht: (they are quite regularly there for $595 with AWIC, ECU, turbo, pipes, shafts and auto tranny.)
this place ROCKS!
Contact your local JDM engine importer (the high-volume replacement engine dude - not the rice shop, i.e. JDM Direct) and get the best price from him. I'd be suprised if you couldn't get a complete JDM legacy turbo engine for less than 750USD. http://www.usedengine.com/
. Again, not armchair theory. I have bought from these guys.
BTW I have an EJ25 so I am always interested in what people are doing. I'm thinking about that DELTA grind. However, the 2.5 is an amazing engine as it is.
PS Don't for get that ignorance and stupidity are two completey different things.