I now have 298,000km, about (180,000mls), over 19 yrs on the original equipment Toyota head gasket and bolts.(On my 93' 3vz) I would go with OE, Toyota supplied stuff at just about any premium on a job like this. Unless you have fantastic credentials on any aftermarket supplier, recently, I don't think I've met one yet that can match or even come close to the quality and reliability of OE. The rest of them are all getting to be a pure Crap Shoot.
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Domesticon Prime

93' LE V-6, 303K Km., fully optioned including Leather Interior. ES300 rear discs, twin piston front calipers, Depo Chromes with HID projectors, 17" OZ' summer's, 96 corner lights, MAF, timing, exhaust and intake mods, 2001 Toyota/JBL sound, + more and always more coming.