Hi Ian G. My second build was the same as yours. My first build was a F450 X frame. I built that one with cheap parts because I didn't know any better at the time. What a disaster and expensive replacing all the junk parts I had bought. Save your pennies until you can afford good quality. What I decided on the Reptile is what I consider a reasonably priced set-up. I learned the hard way not to bottom feed. Motors; SunnySky 2216-800kv uses sealed bearings, efficient, well balanced, swinging 12x3.8 props on 3s and 11x5.5 on 4s. ESC's; ZTW Spider 30a Small ( plug and play, no programming) operate to 600HZ and run very cool. Castle Creations UBEC. XAircraft MiniX w/Gps and OSD, basically plug and play/ literally 60 seconds to set up.To save some money you could start with a KK board and move up later. HobbyKing FPV in a box starter set. I kept the battery wires short(12ga.) and the motor wires long It was a smooth, stable flyer on the 3s. It easily lifted FPV gear and a big battery. It really boogied on the 4s! That's when I crashed it badly. Mostly 'cause I'm such a awesome pilot.........
I'm using the power system on another quad now. This hobby is addictive! You're gonna have a ball!!!!