First had a 450 to go with my RC. Tried a Lee1000 and finally gave it away. Ended up getting a 650 and later a used 1050 (for less than a new 650). I oft times use the 650 to size rifle brass, then clean the lube of the cases, trim, ect, before I run them thru the 650 to load them. Sometimes I process the brass and use the RC to load the cases
I only load for about an hour on my presses as much more than that, causes me shoulder pain (surgery there many years ago). 1050 is a good machine but if changing calibers much, the 650 is a lot easier to do such.
I would lean towards the 650.