I'd suggest you hunt for a 2nd had K10D (~$650) or a new K200D (~$750; could be lower now). Try MS color or Orient Photo
I got K100D when it 1st came out in 2007. Paid $1270 for it w/ kit lens and the usual PC show bag of junk... er goodies
I've not out grown it even now, as I personally believe that the point of a SLR is the ability for control of exposure and depth of field (shutter, aperture, iso), utilization of lens characteristics (rendition of color, bokeh, sharpness/softness, contrasts). The camera is no more than a digital film for me. Admittedly, a camera body does need to have some nice bells and whistles to 'enable' the photographer (Shake reduction, spot metering, large+bright viewfinder, low noise pref at higher and higher ISO, good resolution, good color interpretation).
Here is what I like about Pentax cameras and K100D in particular
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1. Very good value for money vs cameras of same price point
2. No lacking or cutting off of the 'essential' features to differentiate lower end model vs higher end models
3. Excellent construction/build standard
4. Compatibility to very good, cheap legacy lenses. (don't look down on this, it can play a significant part in filling (cheaply) rarely used lens ranges and 'fun' options)
5. Excellent lenses (esp. 'wide' normal, normal, short portrait to short tele)
6. Lenses are usually less costly vs other major brands
7. Nice color rendition.
8. On camera shake reduction, spot metering
Why I suggest you get K200D or K10D
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1. K100DS is really old (2 generations old in fact)
2. Auto WB is not as 'smart' as K200D and new cameras
3. The offered price $680 is just that little bit high in my opinion vs K200D new (~$750) or K10D 2nd hand (~$650)
4. 6Mp is showing its age for me. Still excellent for viewing and prints (which I do a fair bit), but cropping photos will show the limitation of 7mp.
5. The newer pentax models come with better customization options