I think it all depends on which button type you prefer... I tend to be a bottom button kinda guy, so I have to vote for the Telescope (just be careful with the button, I've heard horror stories of them breaking). The Natural is, I believe, ALL stainless, and I've heard stainless connections aren't the best. The Drawtube I've heard nothing about, so I can't comment. But I can say the Telescope was one of my first steps into mods, and while it comfortably sits on my desk now, it still works well.
Also, if you go with the Telescope, make sure you get the "rebuildable" one - the originals aren't really mechanical, and have a wire running through the top cap.