I had been using the K-01 with the DA 40XS and Sigma 24 2.8 macro for months as an "easy to carry" camera and was very happy with it when I came across the Ricoh GR.
A local camera store gave us the opportunity to borrow it for a whole day to give it a test run.
I almost immediately fell in love with its usability, portability and image quality.
I sold my K-01, and I almost always carry the GR in a jacket or coat pocket.
Even when I decide to pack my K-5 IIs with a batch of big lenses to go shooting, I carry my GR ,as it produces images with unbelievable clarity for its size and price point.
A combination of no anti-aliasing filter and the sharpest APS-C wide-angle prime lens give these results :
Ricoh GR Lens on Ricoh GR versus Pentax smc DA 21mm F3.2 AL Limited on Pentax K-50 versus Pentax smc DA 15mm F4 ED AL Limited on Pentax K-50 - Side by side lens comparison - DxOMark
Even when stopped down to F8, the poor DA 21 isn't as sharp as the GR lens wide open, and the DA 15 is even worse !
What's more, the GR retains most of this sharpness even with the 21mm adapter, and the 35mm crop option is very useful, as it crops into the center portion of the image, i.e the sharpest part.
Given that the price points of the DAs and the GR are similar, I wouldn't hesitate for a second if I were in your position
.