I have just inherited a ME-Super body and bought a P30 with Pentax A zoom 28-80 lens. Both are lovely cameras and my one lens seems to work fine on both cameras. These are my first pentax cameras after many years with Praktica / Zeiss gear.
Which are the best (affordable) lenses to use on these cameras, in terms of mount? What is the difference between K bayonet and KA etc?
Thanks in advance for your help.

just picked up a 50mm 1.7 smc from ebay for 6.50 gbp! it really is a lovely lense, and i think i'll use it more than anything else.