RE: good pattern ship reccomendations
I completely agree that the Venus 40 is a great fit for the .50 SX. The Thunder Tiger Imagine 50 is also a very nice ARF that would be well-suited for your .50 SX.
For the .61 FX, I believe you'd find the new Goldberg Skylark 70 ARF to be a very nice fit.
Good luck, and good shopping.