So i am wanting my first rba. I have only had experience with rebuilding Protank heads, and I am semi-seuccessful at it, but I really want a good rba. I've read that the RSST is more beginner friendly, but I like the versatility of the AGI and I don't really mind replacing the center spring, so that's not too big of an issue. Some people have problems with the RSST leaking and I'm really not fond of that or the plastic tank. I like cotton, so I want to start with that, then move on to mesh. What do you guys think I should start with? One of these or something else? I don't think I want to drill out holes like a lot of people do, but I guess I could if I absolutely had to.