My bet will go for the RX21 Kangaroo motor. I love them, they are 7 port so give plenty of punch. The 359 has legs but more a top end engine. Love the RX, you can gear the crap out of them and make them work. I had a GRP, never got much time with it, cheap to maintain though but dogs to break in. My next engine will be AAC, just to give it a bash.