It is nice to buy both, but I think Lipo is more important than Brushless, because it is hard to deal with cells sometimes. If you get a bad cell, the pack is pretty much junk unless you have a seperate cell, but then the cell isn't matched with the other cells. Lipo is so easy and efficient. I have a friend that still runs brushed, and all he does is spray out his motors with motor spray. Lipo with brushed is nice, but when you put Lipo with Brushless, you are all set.
