I'm using the FLI ML8300 with my TSA-120 and find it to be a good match. Here are a couple of Starry Night simulations - field real estate for your ATIK compared with the 8300 chip on the TSA. First at native F/7.5 and the second with the Tak reducer at F/5.6 (highly recommended).
I'd agree about the QSI being a good all in one choice.
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