If you are going to be running SAW, id run a seperate RX pack, BEC i have had issues with in the past, and plus if you buy a 207 astro, you can use it in another boat later and dont have to buy another whole ESC, also it will handle pretty much any motor you throw at it on 6 - 12 cells. perfect for a 700 and 12 cells also- E.G if you ever get into LSO or LSH

Also i run a dubro kwik switch, the hole packed with silicone grease to ensure a watertight seal on my rigger, and the same system on my nitros. saves a lot of hassle, if im running for fun, ill tape the hatch before i leave home, then i can turn radio off to change props without risking toosing too many fingers