I don't think the 60 is as neutral as the 55 from what I hear but thats not necessarily a bad thing. I believe the 75 evolved from the 60. Goodluck with the rack and enjoy your new purchase :)
For what it's worth, Dgarretson and I have modified our VK amps (he has a VK-75SE and I have VK-120 monoblocks) extensively. The VK-120s are excellent stock, but a few modifications transform them into amps I'd put up against monos costing $25k a pair....no joke. If you wanna hear the details of the mods, let me know....
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