AntonV, I, too, think you should keep all the manual focus lenses you have for now, and carefully choose a good auto-focus lens or two to complete your system.
I especially agree with kenafein's advice that you won't get much money when you trade in the lenses you now have.
I have personal experience regarding this: A few months ago, I bought an old Takumar 150mm f4.0 lens in almost mint condition with the original lens hood and case for $44 U.S. dollars.
This lens works perfectly, and I love it, but if I paid only $44 dollars for it at a well known camera store, how much could that store have paid the original seller? $20? Good for me, not so good for the original seller. They didn't cheat the original seller, it's simply what the market will bear.
My advice: Keep all your manual focus lenses now, buy whatever auto-focus lens(es) you decide on, and if you still feel you want to sell your old glass, sell them later, when you're 100% certain, and can take your time getting the most money you can for them.
If you're starting to consider one of the limiteds, let me recommend the DA70mm. For a short telephoto/portrait lens, it can't be beat.
And it was made to sit on the front of a K-01.
Good luck in your decision.
Mike