The Threat was a particle as well (particle pearl) so the Heat might be a good choice as I believe the Threat was supposed to be similar to the original Heat anyways.
I just picked up a Threat in 16lbs. and I love it, wouldn't get rid of it for the world...however mine isn't very flippy, so I think my description of reaction would be a little skewed as I don't see the jump on the backend that most others do...that being the case, perhaps look at the RS-1 from RG if you wanna stay with RG (though it'd be flippier than the way MY Threat is set up...) or the Arsenal Angular would also be a little flippy as well.
--------------------
Andrew Loose
"Evolutionary. Revolutionary."