I'm going to say that 64 dB is probably not enough for a 0.2 mV output cartridge. I have the ARC Ref 2SE phonostage w/ 72 db output and when I had the Ortofon Anna (also w 0.2 mV output), it was not loud enough for me. I could hear the hiss from the phonostage at the higher volumes, which I hated. I have added SUT's to my setup which has lowered the noise floor and no longer hear the hiss from my phonostage at louder volumes. A lot will depend on how loud you like your music.
Phono Pre Gain
I'm considering purchasing a Audio Technica AT-ART9XA for a 1210g. I have a Sutherland 2020 pre that only put out 64db of gain. I've read that the AT requires at least 66db of gain. Anyone have any experience with this? Will the 64db be enough? I'm also considering an Ortofon Cadenze Bronze, but the price point of the AT is very appealing.