SST Ampzilla 2000 v2 vs Son of Ampzilla II


Looking for something new to drive my Dunlavy SC-IVas and am considering SST's Ampzilla offerings. My preamp is an ARC SP3. Hoping someone with a bit more exposure to them could share what they'd consider the pros and cons of each to be and whether the 2000 monoblocks are worth the extra money.
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I just see a biamp option on the back of the new 2000 v2.

@jackd thanks for the heads up. I reached out to him and it looks like I could get better bang for my buck trade wise on a pair of Ampzilla 2000s than for the SOA2. The holidays are making it tougher to find the extra $$$ 😅.

https://static1.squarespace.com/static/5480969de4b0f0d437dda5d4/5697d38fbfe873ec75c280d7/5697d38fbfe873ec75c280d6/1425429391702/amp2000-back.jpg
I ended up getting the Son of Ampzilla II from Underwood, but there is a faint buzzing. It is on both channels regardless of what preamp or input source. :-(
Reach out to EJ at W4S/SST and see if he has any suggestions.  I would try a cheater plug on the amp and preamp and see if that does anything.  
Hi! I've been using my SOA2 (220 VAC version) for almost a year without issues.

Dead silent from both unbalanced and balanced inputs. 

I use as source a Lindemann Musicbook 10 DAC/Pre, and speakers are Dynaudio Confidence C1 Platinum. 

Sebastian