On a budget of $600CAN what is the best tube combo available for a good thrash tone? I am currently using a BC Rich NJ neck-thru Beast with a JB and Jazz, in the bridge and neck respectively. I am willing to buy used/online but I live in Newfoundland(Island) and shipping fees for any moderately sized item are usually ridiculous. I also play a fair bit of southern/stoner metal but I am more interested in having a good thrash tone. Amp must be loud enough to be heard over another guitarist with a Randall RH100 halfstack and a loud drummer.(2 bass drums) I have heard many people mention such combos as the Peavey Valveking and Randall RG50TC but I was wondering if there were any better options on such a small budget.
Used 6505 combo, Used mesa F50
Schecter C-1 Hellraiser
Ibanez EX 470 (1991)

Peavey 6505 combo
Vox Valvetronix AD15VT
Danville 1X12 Cab
Kustom 12w tube

Dunlop Crybaby
DOD overdrive(YJM)
Boss Ns-2
Dod 250 Overdrive