I still haven't decided yet. But I'm between a a Maxxum 7d, and a K100. I REALLY want a camera with two control wheels, as I forsee my learning curve being steeper in a manual mode (and two control wheels ROCK in manual mode). But the cheapest Pentax with two control wheels is more than I want to spend.
And I do not want a camera that is less than a generation or two old. I promise I will be content with a camera of past generation (like the KM Maxxum), and at this phase in my learning, where I still haven't decided what is important to me, buying a new camera, even an entry-level one makes no sense (especially since they wouldn't have the one feature I want, which is the two wheels).
I was in a Ritz store yesterday that had K10D bodies for $650 (no sign, you had to ask for the body only). I think the kit (18-55) was $750. If you hunt for it, I bet you could find an even better deal. Thanks Pentax for the K200/K20!
On the other hand, my K100D is an amazing little camera (but not as little as a Rebel - eww). I have learned more this year about photography than I could ever have imagined there was to know, and have taken 5500 shots essentially for free. The image quality of the K100D is also top drawer, so much so that one review wondered why the jpeg processing in the K10D paled in comparison. While two wheels are nice (and I admit, I pictured myself with that K10D, fingers blazing at both wheels while I dialed in the
perfect exposure), I find that in full manual I am almost always moving one setting to compensate for the other, like watching the meter as I increase the shutter speed on an f/3.5 macro shot. Though two wheels certainly are nice, i find the vast majority of the time I am only changing one setting at once (with moving to a new shot that requires different settings being the exception). While two wheels is a nice feature, I don't think you'd miss it as much as you think. Another thing that can help compensate for the lack of a second wheel is this nifty feature:
Though it may seem gimmicky, I use this a ton in manual mode. Just pressing the AE-L button will adjust the settings to zero the light meter, and you choose whether it adjusts aperture, shutter speed, or both. This means that when I have the camera set to 30s f/22 from some bizarre night experiment and need to set it for an afternoon urban shot, I simply press the AE-L button instead of spinning through one or two wheels until I reach the other end of my settings (I use "Program Line"). Depending on how you set this feature up, it can really reduce the time you spend spinning your wheels by at least getting you into the ballpark.
I would definitely take the K100D over the Maxxum, and at the prices K100Ds are going for these days, I think it's your best bet. The K10D is more solid and has easier access to its manual settings, but I don't think you'd miss it if you don't have the cash.