Slightly lower channel separation and slightly higher THD figures will not be as overtly apparent as a higher inherent noise level, in my view.
How much the low signal to noise ratio will bother you is somewhat dependent on your speaker's treble character and how close you sit to the speakers. Personally, I'd go for a phono preamp with as high a signal to noise ratio as I could afford, especially with a low output moving coil cartridge.
Ultimately, you have to set it up and try it to see if the highish background noise level will bother you in your particular system. Plugging it into an effective AC line filter may help it a bit as well.
How much the low signal to noise ratio will bother you is somewhat dependent on your speaker's treble character and how close you sit to the speakers. Personally, I'd go for a phono preamp with as high a signal to noise ratio as I could afford, especially with a low output moving coil cartridge.
Ultimately, you have to set it up and try it to see if the highish background noise level will bother you in your particular system. Plugging it into an effective AC line filter may help it a bit as well.