Originally posted by Audrius Thank you everybody for your insights, they are very very helpful and I appreciate each of them a lot! You are right, probably I don't need grip, a few extra batteries would be enough. And I agree about the remark on too many actuations for the Pentax K-3 I was willing to buy. At the moment I have no photo-equipment, that's why I was thinking to buy a more universal lens together with a body and to re-build my set later on. I do not have an option to choose an extended warranty on K70. As climbmountainway said, I am starting to think, maybe these two are really not my only options, maybe I could wait for K3, K3ii or KP body and buy a lens separately. The thing is I am on a tight budget, but I looked at the forum-sales and saw there were some good options before, so something similar could probably come up again.
Yes, there are options. Depends on your ability or desire to wait for the right deal for the right equipment. The K-70 is by far the most full-featured and top-performing out there for an "entry-level" model. With other brands, going for a body having WR (weather-resistant) construction you'd be shopping in the $1,000 + range, and another $1,000 plus for a WR lens.
You are right about the versatility.. and the really very fine quality of the DA 18-135mm lens, and when bundled as a kit with the K-70 purchased new, this can be an outstanding value. I just checked B&H here in the US, who offer this package for about $800 USD and even have it with some very useful extras at no charge. As to the capability of this lens, look in the SLR lens section of these forums for the thread- "DA 18-135mm DC WR show us what it can do" to see for yourself the fine results it is capable of. I suggest starting with the last page first and work backwards. You will be impressed. Additionally, the AF performance of this lens is exceptionally fast, quiet, and accurate, and its compact design with exceptional build quality for the cost makes it even more outstanding.