Wanna run a 3.5, which one?

I have been running 2K for a couple of years and am ready to step up to the next level.

Have a F350, 300 amp alt, 2 batteries, 2 runs of 1/0

I will be running under 1 ohm as I have 3 - 4 ohm DVC subs

My buddy recommends the Wolfram but it is on backorder for a while.

What other amps do you recommend?

I wish I had the budget for a Sundown but cannot swing it.  

Looking to stay around $450