Hi Rob. I wouldn't go with an SDS. There are far better helmet's available for less money. Although I don't know how much the one is that you are thinking of getting, but if it's as much as they usualy go for then IMHO it's too much. I can't say how well it would go with RT or AM though. I got an SDS before I found FISD and the the battlespec is a decent enough lid but when compared with other makers you can see the difference. I had to take mine apart and rebuild it. There are some folks that have done upgrades on theirs and they look very nice but I would go for a different make.