Having both, I'd suggest the SOlution PowerPlus EX.
It's slightly cleaner through the heads, handles maybe an ever so slightly lower oil volume and still hits like a Track Mack Truck.
The Heat Blast is more of a solid, I believe, and while the core has similar specs, it gives a different shape to the ball path, in general.
A closer match than the Heat Blast might be the Solution PowerPlus solid, IF you give it a good dose of polish. It has the same core as the Solution PP EX and the CrunchTime. The Slash is a good candidate for the same reason, but it also needs a good polish.
But check on EBay first; I've seen a few CrunchTimes there from time to time. In fact I bought my last one there, new.
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"None are so blind as those who will not see."