The first thing that comes to mind when reading this is the sign in my shop that says:
"We offer the following: Quality Parts, Fast Service, Cheap Price. You can have 2 of the above."
When it comes to pistons what you are looking for is the deletion of the most important factor.
$200 is not out of line for a 4 piston/ring set. I doubt the CSMNL parts are higher compression than stock.