Duratrax is a more econo mfg, but parts are cheap and redily available.
I have owned an HPI, infact I have owned 2 nitro HPI cars, and really... you can do better for cheaper. In the long run the Associated NTC3 RTR+
http://www2.towerhobbies.com/cgi-bin...&I=LXGZJ4&P=ML
is a better choice. It sports a WAY better suspension geometry than the HPI does. The HPI is easy to work on, but if you plan on using the car in a more race type setting I think the TC3 is easier to setup. That and since the TC3 is way more popular than the HPI in racing areas, there are lots of setup sheets (full details on how to setup the car for a specific use) , aftermarket parts, and knowledgable people available.
I mean this is my HPI RS4 3 SS from last year:
http://forums.procooling.com/vbb/att...achmentid=3001
mind you to get to the level that that car was at it cost nearly 1000$, that should give you some ideal of the amount of work it takes to keep an HPI competative.