MC Cartridge: Elliptical; around 0.5mv; track 1.25-1.75; Affordable

A very easy recommendation would be the Hana EL....it fits all your parameters and sounds beautiful. Or buy the Hana SL with shibata Stylus......

Count my vote for the Denon DL-301II. That is what I use, and I like it very much. My previous favorite cartridge was a Shure M91ED, which is similar family to your V15vxmr. The DL-301II is higher compliance than most current MC’s and more similar to the Shures. So if you like your Shure, I think you will really like the DL-301II. 
I found the Denon to be much more focused, more 3D, really a big step up from my Shure even with a JICO SAS stylus. 
But loading is critical. I’ve found 476 ohms to be optimal. 
Good luck!!

I certainly don't doubt the ears of you guys who say you have zeroed in on THE correct load for your MC cartridge.  I have universally found that there IS a load resistance that begins to degrade the sound of an MC, usually one that is significantly less than 10X the internal resistance of the cartridge.  Above that too-low value and at 10X or higher, I hear very little difference in relation to load impedance presented by the phono stage, but if there is a difference, I tend to prefer 47K, in fact.  (I don't use 47K with every MC, just occasionally, for the very reason that I don't hear much difference once I get above 1000R.) This is using at one time or another my Atma-sphere MP1 (tubes), the J&R Phonolinepreamp (SS), or the Manley Steelhead (hybrid) with such cartridges as Koetsu Urushi, AT ART7, Dynavector 17D3, ZYX UNIverse low output version, and Ortofon MC2000 or MC7500.

Ortofon Quintet Red...great cartridge.

Oh boy, what a bottomless pit, my arse hurts!

resolved:

better double budget to $800.
tip to be advanced groove contact: LC, MR, SAS, Shibata
aluminum ok, boron preferred, I avoid more brittle than that.
mc boost to have adjustable loading
tracking force, still like closer to 1.5g, hard to get with MC I see now.

When I make a lot of effort, all this reading, jumping hither and thither, I want to GET something for my effort. I am doing my best to resist 'ADD TO CART'.

I gotta wait till Bill brings two of his MC to listen to here, then IN or OUT?

meanwhile,

MI Moving Iron, the story makes sooo much sense, yet the resultant specs don't seem to indicate achievement of superior channel separation/balance ..., and the prices, forget Soundsmith.
Perhaps Goldring, there is a UK supplier with a new 2400 for $500. Monster 6.5mv output, no mc boost needed.  

HOMC, today's research, better get a pillow to sit on.