The EJ22T sold in the US was a closed deck block complete with oil squirters. It does not have forged internals which is what seperates it from a 22B. If you wanted to get the strongest block in the US without importing one the EJ22T block is the one to use. Place in new internals and put your WRX heads on and you are ready to rock a 2.2L fully closed deck.
If you don't upgrade the pistons your compression ratio will be lower than stock also.
The 2.5L is a semi-closed deck so the EJ22T block is superior.
Here's some wiki info
http://en.wikipedia.org/wiki/Subaru_EJ_engine#EJ22T
Now there is obviously more to this swap, but don't sell the EJ22T short.
Here's the best place for EJ22T info
http://bbs.legacycentral.org