Out of these two cartridges which would you choose?

I have the 2m Black for over 3 years and I'm always regretting the turn to MMs after I've sold my VDH Colibri XPP
From the current available catalog of new MMs, the 2m Black is top after the Clearaudio Maestro II and perhaps the AT-150 MLX in a few set-ups.

The 2m Black is not near a revelation upon the 2m Bronze.
The characters are the same. So, if you like to really change something, choose the best without the need for future upgrade :

http://www.ebay.com/itm/Headshell-JVC-Tonabnehmer-Neu-NadelJVC-Z-1S-Komponente-fur-Plattenspieler-/2...

and then set an order for :

http://www.jico-stylus.com/advanced_search_result.php?search_in_description=1&keywords=DT-Z1S+ne...

I agree with your priorities about saving for speakers, 
although it would be nice to tell us what is your poison 
some thoughts & opinions from experienced members can be helpful. 

And please do not forget that until the time of this distant future upgrade, there are 2 major things that matters and really worth to consider :
 Power Cables & Speaker Cables from Physic Harmonic 
http://cablesilk.simplesite.com

Best to you

Dear Jake,
Are you really asking for advice or...what?

They told you ....

1).  2m Black > 20X2 < 2m Bronze
So, no need to wondering any more : Dynavector is not any better !

2).  2m Black   equal to   2m Bronze
So, after a week with Bronze, not much of an upgrade by going to Black.

3).  2m Black   compatibility issues   with your tonearm ?

4).  2m Black   compatibility issues   with your preamp ?

       ............  and you still want one of these carts...?

Cartridge of reference quality (million light years) above these two and with the right output for your Cary, is the JVC/SAS but requires a very careful set-up by an experienced user and also, a very careful handling in use.  If you pull the trigger,  you will never compromise with this one as it stands at the very top of MM's. You will never upgrade over this one!

We were suggesting your money  better spend  for A REAL UPGRADE :
 " Incognito wiring and an Expressimo weight "  
 "Physic Harmonic Power & Speaker Cables"  

You said you are "amazed by the performance" ...
Well, .... you ain't seen nothing yet!

Best of Luck