Hi, don't give it a second thought...go brushless and lipo from the start...looks expensive but saves you both time and money in the long run...you'll only end up buying things twice, costing you more if you don't!
Lipo and brushless = long run times, no maintenance, no cell cycling = fit and forget fun!
NiMH's and brushes = short run times, maintenance hastle, battery cycling = no fun!
Enjoy
