Title says it all... How much boost are you GTP guys running on your stock pistons? Intercooled or no? Octane booster?

Currently my blown 98 Firebird is running modified L67 pistons, rods, main bearings, and rings (see www.projectvirus.com/engine.html for details) and I've been pushing about 12 psi intercooled out of an ATI Procharger P600B for about three years with no problems... but I've heard horror stories via word of mouth about how strong the stock L67 pistons truly are. I'm running a 15 psi pulley now but my belt has been slipping horribly so that won't be straightened out for another month or so. But when that happens and I see that boost needle hit the 15 mark I'm hoping I don't hear a big BOOM!

Are there any good aftermarket forged L67 pistons available? What manufacturer, price, compression ratio? For our project car #2 we're trying to go aftermarket in the piston department but if we can't find anything then we'll go with L67 again...

Any info would be greatly appreciated! Cheers...