Originally posted by phillipb I'm ordering the K-x with the 18-55mm kit and then I'll have an M 50mm 1.7 and a M 75-150mm f4.
I'm a bit worried that I might want to look at a new tele that would reach out to the 200-300 range, but I'm really hoping that the 150 would cover most of what I want to shoot.
Basically, almost every picture I've taken at longer than 150mm has been of wildlife - or else, it was a macro shot and I took it at a long focal length because that happened to be the only way I could get decent magnification with the lenses I owned. So for purposes *other* wildlife, I'd say you're reasonably set.
I say "reasonably", because your flexibility is pretty limited for portraits and low light photography. Much if not most indoor photography that is not of stage performances would be done at focal lengths well under 50mm, and much if not most stage photography would be done at focal lengths well over 50mm. Adding a 28 and a 135 is the super easy/cheap way to improve on this. Although I use an M135/3.5, which is only half a stop faster than your zoom. While you can certainly get cheap 135/2.8's too, considering that you're also specifically interested in portraits, you might consider spending just a bit more and getitng an 85 or 100 (M85/2 for around $250-$300; M100/2.8 for $100-$150).
BTW, I have a bias against manual zooms, because I don't think I'd enjoy being compromised with respect to SR 9either having to choose a non-optimal focal length, or feeling obligated to keep changing the SR focal lenght in the menu every time I zoomed). So between that and the possibility that you will find 150mm limiting, I can definitely seem you upgrading that end of things at some point, but that's probably not where I'd be looking first.