A nice tube head!
If you have the money an ENGL Powerball is all you need
if you dont then there are plenty of alternatives..
Crate Blue Voodoo
Peavey 5150/6505 (the combo might be a good idea for you)
Peavey XXX (Not as heavy as the 5150 but alot more versatile, Exodus uses XXX's with a tubescreamer)
JCM 800 with a Proco Rat (Morbid Angel uses a setup like thsi)
JCM 2000
ect..
and a BBE Sonic Maximizer is a good addition
The Peavey 5150 is basically the standard for an affordable metal amp bands like Unearth, Darkest Hour, Arch Enemy, Atreyu, The Haunted, In Flames, Killswitch Engage, Machine Head, All That Remains, Children of Bodom (Something Wild), Dark Tranquility, Exhumed... you get the point.