You maek the call. You asked for a recommendation, and you have heard it. The mod is capable of big power, and I believe safety dictates the batteries match it. You may feel differently and if so, you'll hear no argument from me. The Sammy 25Rs are fine batteries. The VTC4s have a thicker safety margin. As for why I don't see it as a waste of power... I dunno, it's nice to know it's in there if I want it? Kinda like driving a Corvette to the grocery store. I'm not likely to go 100mph. But if some punk kid at a stoplight gives me lip, I might teach him a lesson on the way home We just talked about the Sig 75. The Sammy 25Rs would be perfect in that. I just like VTC4s in regulated mods over 100 watts.
So much of this. I have the sig 150. I typically use it for my subtank mini, and run it at 30w. I don't see it as a waste, though. If I ever want to whip out my mutation, plop in my VTC4s, and ramp it all the way up to 150w, i just do it.
I am the same way with my R6. It is a crotchrocket that can go around 160mph. Rarely ever do I do anything close to that, but it is always fun for when some jackhole in a riced out civic thinks he has something fast. Let them keep up with you for the first few seconds, and then finally just open the throttle all the way and rip away from them. Even if said civic driver isnt around, it can be fun for a backroad or a wide open stretch.