Help me Re-Tube my 5150II

[satanicboner666]

I have a Peavey 5150II head and I play it on a Marshall JCM 800 cab. Absolutely love the amp and its been nothing but amazing to me. My sustain is starting to fade and the tubes have about 3000 hours on them so its time for some new ones! I'm all about playing metal in the styles of Nevermore, Judas Priest, Necrophagist, Darkest Hour, Scar Symmetry ect. and I'm looking for suggestions on a killer Power/Preamp tube setup for my head. Right now it has groove tube(hardness 6) GT 6L6's in it and the factory preamp 12AX7's. Looking for tubes around the same hardness, all the venues I play have good sound so the head never see's past volume 3. I want a really aggressive tight sound nothing muddy! Money is not an issue! Thanks.