I started out much the same way, choosing Pentax DSLR because I already had Pentax lenses. While I'm still with Pentax (now on my 3rd: ist-D; K-10D and now K-5), to be honest I barely ever used my original lenses. Absolutely no offense intended but your existing lenses don't look anything particularly special, just as mine weren't - they look perfectly fine lenses, but it doesn't look as though they are auto-focus, and they just look like regular lenses (i.e., no big zoom or very wide aperture lenses) - pretty much exactly the same as mine.
I found that the kit lenses that I bought with the camera were easily as good as my previous lenses, but also gave me the option of auto-focus (or sticking with manual).
So I wouldn't let the lens dictate the camera as long as your budget can stretch. Usually there's bundle deals on lens+body that work out cheaper than buying the lens later. That said, you can normally pick up the kit lens pretty cheaply on eBay if you decide to get that afterwards.
If you do want to keep using your existing lenses, then one advantage of the Pentax (with all current and recent DSLR models) is that image stabilization is done in the camera body, so can work with any and all lenses - including your original lenses, which helps with keeping steady in lower light or longer exposures. Canon and Nikon require buying image-stabilizing lenses to have this feature, which cost more than the non-stabilized lenses, although the results from having stabilization in the lens are slightly better.
For your option 2, personally I wouldn't consider using your existing lens with an adapter on a different make, unless there was something special about the lens. It's just adding another complexity and generally the adapters don't pass [all of] the connections through so may end up having to manually set aperture and so on.
Knowing what I know now, I wouldn't have let my old film camera lenses tie me to choosing Pentax, but I certainly have no regrets in doing so. I've stuck with Pentax since, even though I've bought new lenses with the new bodies although it would have cost about the same to switch to Canon or Nikon.
All of the main makers have strengths and weaknesses, at the moment I'd say the Canon generally has the edge, but does cost more - and different models vary. But the Nikon and Pentax are pretty close and they all leapfrog one another. All I can really recommend is finding some detailed independent review websites that have reviews and comparison photos from the cameras you're considering and pay close attention to the pros and cons of each.