By "sand track" are you referring to an actual RC track that's run by a local hobby shop, or just a local sand pit? The reason I'm asking is that I'm trying to understand if you're looking to get into sanctioned racing, or if you're just looking to play. If you're interested in getting into racing, I'd suggest that you stick with a brand that the hobby shop running the races stocks parts for, so that when you break on race night, you've got parts available immediately. Additionally, the "house" brand is usually one that's run by the majority of racers, which means you'll have a lot of people right away who can provide a wealth of advice. Once you get your feet underneath you, then it's safe to move on to whatever brands you think may give you the best advantage, but until then, it's best to stick with the brand that you can get parts & support for on race night.