For metallica and 'megadeath' I would definitely stay AWAY from pass labs aleph amps. They have very precise bass, but in your price range the aleph 3 and aleph 5 will be too wimpy. I too have heard that the early ARC solid state amps stank. I have not heard one personally to confirm this. Seems odd that they would have let it out the door.
I would buy an old conrad-johnson mv-50, 52 or 55. These are el-34 based and make electric guitars sound GREAT. No other amp brings out the real sound of an overdriven electric guitar so well. You should be able to find one of these for 600-1500 depending on year/model.
If you want bass string for 1200, buy a mccormack dna-1. Those have awesome bass. If you can find a dna-1/reva or revb you might want to pay the extra cash. Also, the adcom 5802 is a great 300w amp. You can pick those up for under 1000. They are very good sounding amps.
I would buy an old conrad-johnson mv-50, 52 or 55. These are el-34 based and make electric guitars sound GREAT. No other amp brings out the real sound of an overdriven electric guitar so well. You should be able to find one of these for 600-1500 depending on year/model.
If you want bass string for 1200, buy a mccormack dna-1. Those have awesome bass. If you can find a dna-1/reva or revb you might want to pay the extra cash. Also, the adcom 5802 is a great 300w amp. You can pick those up for under 1000. They are very good sounding amps.