the problem only occurs with KR mount lenses, aka ricoh mount. On those lenses, there's a little pin on the mount that can get stuck in the slot for the AF motor on your camera, resulting in stuck lens. Besides those lenses, there arent any removal issues, all my fast primes are MF lenses =)
as for lens recommendations, the 35 f/2.4 is a great lens to start out on. If you want to go even cheaper, i vote for one of the older MF 50 f/1.4 lenses. Super awesome image quality, slightly longer focal length (short tele, so great for portraits) and that amazing f/1.4 aperture.
for the samyang, i say you should hold off on that for a while. While the samyang is a great lens, it is a bit hard to use if you're not used to manually focusing (very shallow dof). Also, it gives you the field of view of a 135mm f2 lens, which is a bit long if you dont have anything else to compliment it with.
as for the k-5, do you really need everything it offers? if you're just starting out, it might be better to choose something like a k-x or k20d and spend the rest of the money on good glass. Good glass is a much better investment than a body that's way beyond what you're used to. Of course, if you know you can fully take advantage of the k-5, i say go for it, the body is a beast. Just remember that 1.5k spent on a k-5 and lens wont get you the kinds of images you can pull off with about 500 on a slightly older body and 1k in good glass.
heres a video about what i mean:
Originally posted by nick52 
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