I think the decisions lies with you. There are valuable inputs on whether a KR or K30 would be a better choice.
If you don't want to burst your budget or saved up, KR will be the best.
If you are willing to save up, K30 will be nice. I believe there are some brand new K30 still at shop, if not our B&S sure will have once K3 is out.
For me, i would recommend the K30. I try out the KR before, but it was not with me for long as I already have the K5 and I still prefer my K5.
I sold my K5 for K30 and to me, the K30 is damn good and much better than K5 in some ways.
Reasons why K30 over KR:
KR have Penta-mirror, approx. 96% field of view and the K30 have Penta-prism, 100% field of view. The difference in percentage may not be much but it is brighter and have higher magnification which is the same as the K5.
Dual Dials is a nice addition, and a great use when using Pentax TAV mode.
The AF module of the K30 is really a great improvement. The K5ii/iis only beat it with it better low light focus ability.
And lastly, the higher ISO of the K30 is much better. The sensor should be also the same one on the K50. It is still one of the best sensor in the market. Good Dynamic range and good high ISO up to 6400 (To me, 6400 is acceptable to me.)
It does not means the KR is not good. Lots of user here uses their KX/KR very well and does a better job than me.
Happy deciding..