best gasket choice for rb20 exhaust manifold?

[Sully]

i just recently replaced my exhaust manifold gaskets for a rb20. now its leaking again! so im thinking that the gaskets i bought were cheap.... can anyone tell me what would be the best choice for a new gasket kit would be?

[Black BNR32]

cometic with some copper spray
copper lock nuts torqued to spec
prep the mani and head with wd40 and sandpaper and a flat block in 3 stages up to 1000 grit

[Skym]

If you don't skim the exhaust manifold flange, it can leak (it can be warped). Use factory exhaust gasket and make sure you replace all the studs (should be done every 10 years or so) with new studs.