I might be too late and I sure am, but I only wanted to say that a guitar/pick-up is chosen directly linked to the kind of metal you play. In your case, its enough to say doom-metal and you realize the chords will be long, no need for extreme palm muting, the sound would have to be dark, full, fat, with very long sustain (this also indicates the wood of the guitar body, absolutely fixed system), more bass freq than the usual, etc. I would also say I hope EMG's 707 will work for you, although to be honest I find JB+mahogany a much better combination for down-tempo melodic metal styles. But maybe it is only the case it worked for me.
From the amps you listed there, the only one which will really work for doom is the Savage. Lately I discovered a good amp for doom-metal, the Marshall ModeFour. It really works for long notes and/or old Anathema like low end sound.
The last time I've checked I was asked 2344 Euros for a Mayones 7 string custom, so no way.