Best Cartridge for my system, MC or MM ??

I'm a huge fan of Dynavector and have found their carts to be neutral, revealing and very musical with a superior soundstage in comparison to others over many years. I'd suggest you consider going with the 20X2 H instead of the 10X5. It has a slightly higher output and offers superior cantilever technology. It should also do a good job of energizing your speakers as they are comparatively inefficient. It isn't even that much more money. Good luck & happy listening!

The carts are of the same class of performance and one may prefer one over the other. The most important point that cartridge matches arm and table so "2 worlds apart" is totally irrelevant.

I would check the specs on your phono pre.If your using the stock McIntosh you will most likely only be able to use MM or high output MC. 4.0 mv or better ,if I recall correctly.So if needed you can always purchase a external phono preamp so you can use a wider range of cartridges.Also, matching the arm with the cartridge compliance is paramount.

Bad info on the 10X5 being worlds apart from the Virtuoso.
It is not.
Give consideration to an Audio Technica AT-150MLX. It plays far beyond its' price and both of the cartridges mentioned here.

You can also consider an Audio-Technica AT-160ML or even AT170-ML/OCC, probably not cheap second hand but you don´t have to regret ;
Also SHURE ML-140HE won´t be disappointing.
Anyway, a high compliant & high out put voltage cartridge.