Nonooo.. too early to buy things! You should get the design done and do a lot of research first to avoid mistakes.

That set is very mismatched. The lengths of the rails implies it is intended for a machine with, roughly, 1000x1550 travel however only the Z-axis ballscrew is the most optimal size. The problem is the critical speed of the screw, which is the rotational speed at which the screw will start whipping/vibrating excessively, imposes a lower limit on the diameter of ballscrew you can use for a given length. Short answer is up to about 600mm use RM1605 and up to 1500mm use RM1610. The reason for that is using the 10mm pitch screw instead of 5mm means the rpm for a given feedrate is halved, so if you are limited by the critical speed, this doubles the possible feedrate.