First, Sig makes great products. If you have the time, and desire, to build, go for a kit. Otherwise, choose an ARF for your first plane and buy a kit for the second. This will get you in the air faster and you won't have as much time invested in the building phase of learning. Good choice for the radio, I've got one and it works great. The OS 46 will work well in a trainer and gives you lots of options for future planes. Are you going to buy from a local shop or online?