The Havocs are OK, but i'd see how much space you have and check out the specs. A friend has one in his off roader and has no problem with it.
I use Tekin, but their gear is a bit pricier than some. In saying that, I have 4 of their ESC's and never had a single problem
Regardless of brand, use sensored for on-road touring, sensorless will cog like a bugger.
The key is really how competitive you want to be. If you just want to get track time and hone your skills, the Havoc will be fine. BUT, be under no illusion that all other things equal, the Havoc will not out-perform a Tekin RS Pro or LRP SPX or KO Propo BMC