I just purchased a k100d with the kit lens and I've been generally happy.
I've found that I have great want for a longer lens, probably somewhere in the 100-200mm range, however, there is a catch and that will probably have to wait:
I have a baby due in October, and our baby is the whole reason we replaced our old crappy P&S with an SLR, instead of just getting a new, less crappy P&S.
I can afford one lens priced in the $250 range (post rebate, if any).
Along the lines of this thread, I do not wish to be using a flash when photographing my baby:
https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/10124-portraits-lens-k100d.html
Now, when I walk around outside I really enjoy the 35-40mm range and for this reason I have seriously considered the 40mm f/2.8 pancake but... I wonder, would it or the 50mm f/1.4 do a better job in the house? The kit lens has been disappointing inside without flash or good lighting.
To summarize what I'm looking for:
1.) Needs to beat the kit lens in as many aspects as possible.
2.) Needs to work in low light (in doors, without flash).
3.) Needs to be good for (semi-)portrait as well as scenery, street-level, etc.
4.) Needs to be around $250 (can be $250 after rebates).
I'm sure I've missed something although I've spent a lot of time pouring over reviews etc.
Please let me know if you can think of any lenses that would help. Also, please point out if replacing the kit lens for these purposes might be silly and getting a longer lens to round out my capabilities would be wiser.
I'm open to the idea of zooms and third party lenses, but I've been seriously eyeballing the 40/2.8 & 50/1.4 (but you wont offend/bother/hurt my feelings if you suggest something else or just steer me away from them).
Thanks for any input in advance!