.
I like the DA 40 for a couple reasons, one of which is that if focuses
quickly and allows you to capture moving/bobbing objects:
Also, it's sharpness kinda gets overlooked, but this is an extremely sharp lens.
I often print things at 8x10 and more, and one of the sharpest prints I've made if not
the sharpest has come from this lens. The image below, when printed large, is
stunningly sharp:
That being said, I think I've seen more 'wow' shots online from the 43 than the
40.
But you can get the 40 for ~$200 used, so it's one of those lenses you can talk
yourself into easily. 
.
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K20D + K2000
DA* 50-135 f2.8 | DA 12-24 f4, 35ltd f2.8 Macro | FA 77ltd 1.8, 43 ltd 1.9, 35 f/2 | F 50 1.7 | K 55 1.8, 35 3.5 | M 200 f4, 135 3.5, 100 2.8, 85 2, 50 1.4, 50 1.7, 28 2.8, 75-150 f/4 | Super Takumar 135 f3.5, 55 f2, 55 1.8, 50 1.4, 35 3.5 | Vivitar 100 2.8 Macro, 28 2.8 ("K2") | Tamron 28-75 2.8 XR LD Di , 70-200 2.8 LD Di Macro | Sigma 70 f/2.8 EX DG Macro | Cosina 55 f/1.2
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