RE: BCE JAMMIN 8T or MBX5T?
BCE chassis are great. I have one on my strr and I just race. Its durable enough for bashing but I couldnt see tossing 100 bucks plus just to bash around or not race. If you plan on racing, stick with what you have and replace once stuff as it wears out. If the chassis wears thin or gets bent, then BCE upgrade or even just a stock replacement.
You can toss a grand at any rc and still not run fast on a track if you dont get the basics down. Diff oils, shock oils, toe plates and alot of other stuff. Just start out basic and go from there. Most club racers will help out with set up tips for your track if you plan on racing. Seems every track has just alittle diffrent set up.
If I were you I would just run it till it breaks the upgrade. I also hear Jammin will have a new truggy out before long, about the time the truggy nats run.