I think ur also forgetting about the CEN Matrix TR arena. I seen a few at the track and the .28 engine it comes with screams. I'm really didn't want to believe it, but after I saw one at the track, I was quite suprised.

And it's about the same price range as the Mantis, maybe just a little more but not much and definitely cheaper than the Hellfire and Jammin RTRs.

When I saw that the CEN comes stock also with a 7075 chassis,shock towers, and diff brace, and the .28 3 port engine I thought it was gonna cost closer to 600 but most places sell it for about $470.