Bummer about not being able to find the HE pistons. Probe makes some 3.902 forged pistons for around $100 more than what Summit lists the stock replacement HE pistons for
http://www.ws6project.com/user_stor/...oducts_id=4272
Another thing you might want to ask the machine shop about is the rods. Most of the aftermarket/replacement bolts will oval the rods and require a rehoning and oversized bearings. My local machine shops were wanting $175-200 to install ARP rod bolts and do a rehone/recondition on the old rods. For less than $100 more you can get Eagle or Scat I-Beams with ARP bolts included
http://www.ws6project.com/user_stor/...index-1-4a.php
Yeah there are better options out there if you want to spend the extra $$$ but as long as you aren't going over 500ish HP the budget stuff should work just fine and not cost much more than HE pistons with reworked factory rods.