I have both of the above supplies. The SS-30M is used with my K2/100+KAT100 and works great. The RS-35 is an old workhorse that I've used with a series of 100 W rigs (TS-440 and now TS-570).. In keeping with the portable nature of the K2/100, I would recommend the SS-30 for use with it. 73, Phil