I am looking for a ball for wet/dry conditions. From what
I have heard and read the Core Power HRG would be a good
choice for this condition. I was thinking of also maybe a
Power Charge but have heard that there is a problem with
this ball cracking. Last night the owner of the pro shop
where I bowl suggested the Throttle-R for wet/dry
conditions. Any suggestions or info on either of these
balls would be appreciated.

A great deal depends on your style.  The Throttle R, for me (and for 4 other people) has not really been "snappy".  It makes a longish turn and hooks a substantial amount, but not hard left (for a righty).  I wasn't able to use it anywhere except a hard overblock wet/dry.  If you have a ton of hand (or almost no hand and low speed) it could be a little unpredictable because of the strength of the core.  But for many people, it probably would work on a hard wet/dry, because the coverstock elongates the breakpoint.  

The Core Power HRG is a smoothish Storm, though it does make a relatively clean, hard turn.  It can be a little snippy, but, in my experience and observation, it works very well on wet-dries.  Frankly, for a true overblock, the Throttle R (which I really disliked for my style) is probably the better of the two for more people because of the length it gets through the heads and the longish break area.
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"I don't mind if you don't like my manners. I don't like them myself. They're pretty bad. I grieve over them on long winter evenings."