This question depends a bit on where you are and what you intend to shoot. I assume from your OP that you have some idea of how to shoot but you are looking to explore wider possibilities of what to shoot once you get your own gear. I went with a K-x and 18-55 when i was in your position a couple of years ago. These comments are based on that experience, so some observations are highly personal and may not be relevent to you.
Of the two options you give, I would definately get the K-R. As I said, I went for the K-x a couple of years ago, but there was no real equivelant of the K30 back then which complicates things (I reckon the K-30 represents amazing value just now). If you get the K-30, you'll certainly have a great body and a decent kit lens but not much else. You'll have a bit of cash left over for a really cheap second hand zoom, or macro or prime... or, more realistically, a memory card, a cheap bag and spare battery.
With the K-R you'll get a damn good beginner's camera, and money to buy some extras that are often overlooked by people starting out.See below for details included in the alternative I suggest.
However... do consider starting with an older second hand body, maybe a K10d, or K100. It'll be even cheaper than the KR but you'll get a good solid body with PLENTY of room to grow into. But... you'll have more cash to spend on stuff like a couple of cheap second hand lenses and... drumroll... a tripod and some software! A decent tripod can be had for $100 (yes, its true... not the best, but decent) and you can scrounge an older copy of elements or lightroom (or Gimp for free if you have the knowhow!). Seriously, tripod, software and a few little odds and ends like a remote shutter release will make a world of difference to the things you can shoot and what you can do with your shots. Yes, okay, they won't be limiteds, and you WILL grow out of them... but you'll be growing out of cheap gear able to get the job done and will have more opportunity to explore wider photographic possibilities in the meantime.
For cheap lenses, lots of people seem to be flogging of MZ series film cameras that often come with two kit lenses; a Sigma 28-80 Macro and a Sigma 100-300mm zoom or similar. A good set of those can be had for $100 round here and are more than capable of letting you explore until you figure out what you are really into. Lenses and tripods are similar in some respects; go cheap early to find out what floats your boat... but after that make sure you get the best you afford.
If I know if I had my time again, that's the way I would spend my first $700. I left it way to long before i found out why a tripod is so essential, and bought a pretty good zoom before I had a chance to figure out that a good portrait prime was what I really wanted...
But, hey... either way you are going to have fun, so enjoy!