HCAF Is harmony central amps forum, the most ignorant, ass backward place on harmony central
Anyway, the 5150 is a decent metal amp, but its got a distortion that sounds like a 5150 24/7 (later machine head, arch enemy, every other death metal band) and some of my favourite recorded tones are on them, but when compared to any engl, let alone the savage, they arent nearly as versatile, especially in their cleans and crunch sounds and also in that engls have more variable controls and take an EQ pedal very well to be able to get open, brighter tones and darker, thicker tones - my powerball can get *something like* each of those sounds properly dialed in, but it wont nail any of them - it still sounds mostly like a powerball.
A 5150 might sound great to you, but its never going to reasonably emulate a slayer tone (save maybe diabolous in musica, divine intervantion and maybe god hates us all; the darker, smoother sounds), or mastodons fat, bright crunch or deaths razor-edged tone. It wont do a half bad job of nevermore (I think some NM is actually recorded on 5150, iirc) and CC.
No one amp is going to sound like a rectifier (cannibal corpse), krank (nevermore), JCM800 (slayer) laney VH100 and I forget what marshalls (mastodon) or VS100s (I think, but I've seen doubt cast on that - death). A savage, powerball, invader, or if youre feeling rich a Diezel will get you closest to getting in the ball park of all of them, but wont nail the lot.
Most important thing on the amp is try out a bunch of them and get the one that fits whatever summation/interpretation of all these other sounds = your style and go with that. This is doubly important if its your first valve amp - I dont believe that that purchase should be made without EXTENSIVE play testing (because I didnt and went through a few before getting my PB, which I'm mostly happy with, but still hunting for the imaginary sound in my head).
Try to get it second hand too, since your first amp is unlikely to be your last and you dont want to be at a loss when you sell it on, which theres a higher chance of with your first than any other!
JMO.