I recommend browns, personally... They're nice and light, and have no problem keeping up even with incredibly quick runs. I disagree with Thran about blues though, most people will have no problem with blues, but if you tend to not completely release the key, they won't reactivate. Apparently most people do completely release the key, and so it's not an issue for them, but I find when I get up to very quick runs of two alternating keys, I don't always release entirely, and I'd end up with occasional missed keys on blues. As for linear, I don't care for blacks at all, I find them tiring to type on and tiring to game on. I haven't tried reds because of the expense and lack of tenkeyless options, but I'm very happy with browns so I'm not super concerned with trying them out yet.