Hi Peter,
I went with a KAF8300 chip; specifically the STT-8300M, though I am still awaiting its arrival so I can't really comment to its performance just yet.
For me, I'll be imaging numerous targets at f/3.6, f/5, and f/8 with an FSQ106 refractor. My major concern with the chip while deciding are a few issues with binning, but this doesn't seem to be a major issue and you just need to be aware of the limitations and account for them.
I've seen some good results with a KAF8300 and the TEC140. There should be a few people on here who would have experience using these chips, a fair few people post images on here captured with either the QSI or SBIG variants - even in light poluted locations. Have you looked into narrowband?
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