I would skip the af360 because of the missing swivel function AND that you cannot disable auto power-off. If you grow using your flash you might want to experiment with off camera flash and radio triggers and the auto power off will drive you crazy. Also flash power is very important, so the metz 48, 58 and pentax af540 are the better choices.
I don't find the metz58 and the af540 bulky, but for a first flash the metz 48 on a k-x is an excellent choice. You'll only need automatic mode on your flash if you plan on buying old lenses which don't have an A-setting on the aperture ring. Many MF lenses do have an A-setting and these will work just fine with the Metz-48.
The lenses without an A-setting are the M (eg M50/1.7, M135/3.5) and K series. The A50/1.7 has an A setting.
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