Myślę, że podobnej klasy i charakterem to w sumie szukałbym w Soldano, ale tego raczej za 3k nie wyciągniesz...
Dobra, zatem do rzeczy. Vai także używał marshalli. Oto co wygrzebałem w internecie. Mam nadzieję, że znasz angielski.

From Marshall Law mag. Vol.5, Nº2, 1988
Steve Vai talking about Marshall: "I have to do what's right for me, 'cause I have to shave this face in the morning".... (That was before Carvin fulled his pocket I guess LOL)
"You can still develop a unique sound on it. And you're not gonna sound like everyone else if you use a Mrshall. Marshall gives me what I need in order for me to shape my sound, live and in the studio"
During many years Steve used mainly a 100w Marshall through 4x12" Celestion 30s.
Talking about P&W
"seven different Marshall 100 watt heads were used throughout the recordings, all moded by Jose Arrendondo.
They were run differently at different times for a desired effect. Sometimes I went out of the line level to the Bradshaw Rack, and sometimes it was just directly out of the head into the cabs.
On the tune "Liberty," a specially made direct box was constructed for me by Steve Firlotte. It utilizes an old transformer I had laying around. It's extremely clean and useful. "
Dodam, że z tego co mi wiadomo używał głównie Marshall 6100 30th anniversary i JCM800.