RE: which one would u recommend?
Buy an LST2 and several sets of extra suspensions arms. The Hellfire is a different type of truck and an unfair comparison. None of those trucks can do what the Helffire can on the track, and the Hellfire won't do what the others can at the bash spot.
How likely is it that your truck is going to stay factory? Almost none, if you're like most people. So, pick the best platform and deal with the factory parts that you don't like until you can upgrade it. I'm a Savage owner, so I'm a little biased here, but I'm convinced that a modified Savage is a much better truck than the others listed. Savages don't handle worth a crap factory and they aren't known for being fast, but they have the most solid foundation by far.