What's A Good Upgrade From A Manley Steelhead?

OP,

Given the level of nuance we are talking about in Phono stages… I think you have to listen to an Audio Research to make up your own mind. To me they perfectly nail midrange bloom without being “warm” for the sake of warm. I can say that for me the ATC Reference 3SE is the best, musical, detailed phonostage I have ever heard. 

@drbond 

Good point. This is particularly important at lower levels of investment… my rule is double the cost or it is likely a sideways step. So, we agree.
 

However, at this level, one must assume a more discerning pallet and a flavor change would be a big change. Here I would consider a Audio Research, Conrad Johnson, and a couple other top tier. 

You have a great turntable and cartridge. You ask a great question.

The phono stage has a huge impact on the sound you get from the turntable / cartridge. I would recommend an Audio Research PH-8 or higher…there is a PH-9, Also a level up I have the Reference 3 and Reference 3SE. I have had Audio Research phono stages for over thirty years… to me, they are the standard to judge others. Incredibly natural, dynamic, quiet. I have been using a Reference 3 and 3SE for the last few years, but the PH8 and beyond have been simply stunning.

Anyway, I highly recommend the highest level Audio Research you can get used.