All 12v dc pumps seem ok - CSP750, CSP-MAG, MCP600 > 655 (AQ50Z, D4 / D5), MCP350 / DDC... no flicker experienced and I run them frequently on the desk in front of the monitor at a point where a 1048 has it bouncing round like mad.
Eheim 1046 & 1048 are unshielded and will cause flicker. Eheim 1250 & 1260 are shielded and don't.
IIRC, both Hydor L20 and L30 are unshielded. Never had the chance to try any of the other pumps such as Danner and Iwaki... I can only dream...
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