What's the consensus with tube pre-amps?
As airhead said, you need to spend quite a lot on valve gear before it becomes quiet enough to be worthwhile. And even then you've got the ongoing faff of valves failing.
Also valve phono pres generally just do MM levels, and need (or have one builtin) a step up transformer.
I'd stick with the usual rega, project, Nad phono pres. And yeah, stick with mm carts until you're getting the money gun out.