Based on what you have said you are interested in, I would reccomend you start with a tamiya tiger and infrared battle unit. Built it, learn how it works. Then if you want to go further you can progress to the other RTR brands and convert them to IR and mod them up. Since I have done a few tamiyas and then a few HL conversions, i would reccomend you start with the tamiya. It will teach you what you need to know.m and if you want to progress or just bail out, the resale value is good.