Originally posted by jeffryscott My one concern, if I can call it that, is overall system size.
You'll be hard-pressed to beat a K30 & 18-135WR combo for size, usefulness, IQ and WR. Add to that later some Limited or small FA primes, e.g. 15/35/50/70 and the Pentax DSLR system really becomes unique in size, quality and IQ.
I have a K5 + 18-135WR + DA15,FA35,FA50/1.7,DA70 combo that all fits in a Lowepro Nova 170 bag that travels easily with me everywhere -- small enough (9.5W X 7.1D X 9.6H in./ 24.2 X 18 X 24.5 cm) to comfortably sit at my feet in economy.
If you don't want to spend the $s on the 18-135, the 18-55WR is very usable and renders typical Pentax colours. I don't have any experience of the 50-200, but the 55-300 (DA or DA-L), while not WR is a very, very capable lens. I own both the 18-55WR and DA 55-300.
Originally posted by jeffryscott just wondering what the best bang for the buck is out there
So: new lenses: I would have no hesitation recommending as "best bang for the buck" the 18-55WR and DA-L 55-300 (or the optically identical DA 55-300 if you want focus quickshift and don't mind spending more). As a first prime you can't go wrong with the budget DA 35/2.4.
As for older lenses, once you start down the Pentax road, you have the whole world of older autofocus and manual focus K-mount and M42 bargains to discover among the 24 million lenses Pentax has made since the 1950s.