The Ares Magnum is still pretty damn impressive to me, even now that I've moved it down to my 2nd setup due to buying a VAC Renaissance SE Phono for the main. The Rogue has matched very nicely with Koetsu stones, Shelter Harmony & Accord, and Ortofon Cadenza Bronze. However, to be fair its noise floor certainly comes into play with the 0.3mV Platinum Koetsus. If you're picky about this, you really need at least 0.5mV output to be happy. That may be its most glaring weakness.
I'm currently running in a new Shelter Accord (0.5mV) on this setup, which sound VERY nice (as long as I peg the tracking force to the max of the recommended range :-/). Hooked up the trusty old Sonic Frontiers Phono 1 SE+ for comparison last night, and it sound totally boring and flat next to the Ares Magnum.
That said I'm pretty damn interested in the Herron, if there's additional performance to be gained from that price bracket. I've been hearing owners rave about this thing for literally years now - it never dies down, and I've never heard a sore word about the unit or company (Rogue is a great company too). I might just be tempted to pull the trigger...
jmolsberg - To be clear is your Ares the "Magnum" version? Or a standard build with the blue Cinemag upgrade? I found the Magnum parts upgrades, beside just the blue transformer (which has a huge impact), also made for a notable performance boost. And then some exotic NOS tube choices made for another nice boost. But I realize such tweaks can only take things so far, before it's time to upgrade to a better unit.