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

To OP, 

Should you decide to get another phono stage, get one with adjustable impedance to give you more flexibility when it comes to choosing which MC cartridge. Reading your post last night, I was thinking of recommending the Hana low output, but it needs at least 400 ohms, whereas the Cambridge Duo has a fixed 100 ohms. The Hana would work with 100 ohms, but would not sound best. Happy listening. 

Just my thoughts.
Using a sut to try out MC carts is probably not the best way to start off unless you get VERY lucky.
Careful matching of sut to MC cart is a lot more involved than pot luck.
You would likely be better served with an inexpensive MC load adjustable Phonostage for your entry into the world of MC carts.

For example my Scheu SL will work loaded at 100 ohms but is MUCH more lively at 430ohms. 1000ohms is just a little too much for it to my ears.
But you need the flexibility to try and see for yourself IMHO.

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.