cherry blacks are a bit of an acquired taste I think. In my experience with them anyway they tired out my fingers in a way that M's and F's and Alps did not, even if the "raw" resistance force of all these switches was in the same area around 55-70g. I think the curve of the resistance matters as much as the raw resistance force.
Blacks seem to increase resistance as you push down (as opposed ot the other switches which can actually decrease ressistance (like Ms and Fs) as you push down (after the spring buckles), or alps where the resistance feels about even as you push down). I think that made the difference with blacks, so you're constantly pushing down on jello. Tired out my fingers.
Actually the only person i know who liked blacks was xsphat but even he had to break them in "for about a year".
If you want to try them tho, they're easy to find and pretty cheap, on ebay and etc. But sounds like your best bet is M's or F's though, I think.