Despite some bashing the K-7 has been and is still an excellent dSLR camera. The K-7 design introduced some concepts re-used as such by the K-5 suggesting that Pentax got it right from the start with the K-7: the compact, rugged body, the handling, the viewfinder, the low-ISO IQ, the Hi continuous shooting capability... The list is longer than you think and an used K-7 is a very good value for money.
IMO the main weakness of the K7 is the low-light shooting which can be improved drastically with some fast lens(es) and some simple in-computer PP with dediced noise reduction software. A lesser weakness is AF-C IMHO especially compared to Canikon..
I looked at your website and my first thought is: you want the FA31mm f1.8 Ltd. The FA31mm has a great focal length (equivalent to the old 50mm), not too close, not too wide. The lens has an outstanding IQ: truly outstanding and there is no mistake if the FA31mm has the best score at
Pentax Lens Reviews | Pentax in-depth reviews | PentaxForums.com (see also reviews at Photozone.de, slrgear.com, ...). The lens is fast (f1.8) and it pairs very nicely with K-7. The lens is pricy but it is one of the best, if not the best prime lens. I have a K-7 and the FA31mm is my most used prime lens by far.
I know that I did not answer directly your query for a kit lens. But you do not have to start with a kit lens. I did not...
Hope that the comment will assist.
Welcome to the PF and to the K-7 world.