Ok, well some of you are going to laugh, but I have done a lot of research on these options. Depending on what you are doing, you don't have to spend a ton of money on a new block.
Option 1: get a block from the salvage yard b/c they're cheap and easy to find, usually between $200-500. These motors can be found in all 2001 & up proteges (duh), ford probe 93-97 2.0L, and the laughing one a KIA sportage (not sure what years though, probably late 90's of early 00's).
Option 2: order a JDM complete motor. If you're building a motor, then higher compresion and difference between the US and JDM versions won't matter & you'll have the upgraded intake & exhaust cams plus a whole lot of other spare parts. I have found these before from $500-800.
www.jdmenginescorp.com is a good place to look. Good prices and resonable shipping rates.
Honest I would seriously consider one of the two options and save your money for the for forges internals, and have a builder who is LOCAL with GOOD reputation build it for you. That way you have a direct point of contact should anything go wrong. Its a much bugger hassle trying to get a problem resolved when the other party is out of state. I am speaking from personal experience on this matter. Hope that info helps.