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.
counterreset
Get the SST Ampzilla 2000. Use the money saved to upgrade your signal source. I own (and prefer the SP6) over the older SP3. New mc cartridge, DAC ... BTW, your SC-IVs with the beige grills look really nice! Don't go back to the black!
@kw6 : That I can't say! Either of these new versions made by SST are sonically competitive with today's expensive amps (no need to mention names here!). 
Contact Walter at Underwood HiFi as he was offering a great price on the Son of Ampzilla Mk II.  He has been in the business over 40 years and I am sure he has encountered many pairs of Dunlavy's over the years.  
@counterreset : No, Ampzilla 2000 and the Son Mono's are different circuits - like the originals!