What others said has swayed my slightly, since you said your budget is limited. I'm usually an advocate of using the cheaper camera (K-50 or earlier), but for your scenario it doesn't fit. So at least get the K-5 IIs for the same price as the K-50 kit - its advantages will help for the type of shooting you'll be doing, and an 18-55 and 50-200 won't do you much good anyway. So unless you're planning to get an even cheaper, used body, make the swap for the IIs! Then work on getting a used Tamron 17-50/2.8 and a new Tamron 70-200/2.8 (not sure you can save enough by going used on that one) ASAP - or whatever similar lenses suit your needs and taste.
You'll probably be fine with the K-5 IIs (I haven't upgraded mine yet) for a year. Even 6 months from now the K-3 will be cheaper and you'll have other options as well, so now's not the time for a K-3 from an economic standpoint - it will depreciate rather rapidly, probably before you're able to take advantage of it compared to a K-5 IIs. The K-5 IIs also has $40 third party battery grips if you need one, and the camera is solid and reliable.
Until you get one or two appropriate AF lenses you're just loosing time. The K-5 IIs is the sweet spot right now. Save your upgrade for later. I bet you'll realize you didn't need the K-3 anyway. But even if you find you were "wrong," the future price drop on the K-3 is likely to exceed the depreciation on the K-5 IIs, so you still come out ahead.
Last edited by DSims; 06-25-2014 at 04:37 PM.