Some ideas for you to consider.
Don't take anything to gigs you aren't willing to see get stolen or trashed. Stuff happens.
The big stars take expensive guitars to gigs but they also have security for them and can afford to replace them.
Ibanez 7 stringers if you want to play heavy duty thrash and death metal. They look the part.
If you want to go with a half stack, I'd suggest looking for used Mesa, Saldano, or Marshall. 50 watt tube head anyway.
100 if you aren't going to be miking the cab.
A MT2 pedal. So you can get that metal sound without having to put your volume/gain on 10.