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
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!
GAS offered a transformer for bridging the original Ampzilla and the Son. 600wpc and 240wpc, respectively. Into 8 ohms, of course! 
Apparently there were two versions of the SST Ampzilla. V1 and V2. The latter used the same input stage as the Son mono amps.