I agree with Daverz; whether an outboard phono stage is better than what you're using now is something you'll need to determine by listening. For example, I found the Grado phono stage to be better than the built-in stage of my LK1 preamp, but not quite as good as the phono stage in my Audio by Van Alstine OmegaStar PAT-5 (when using a Grado Green cartridge; I did end up buying a Grado PH-1 so I could try Grado's low output cartridges, which my OmegaStar lacks the flexibility to support).
The Dynavector P-75 sounded good, but no better than the built-in stage of a Linn Wakonda I was auditioning at the time (comparison made with 10X5 cartridge), and I didn't like the combination of the 10X5/P-75 as well as the less costly Grado Green/PH-1 set.
I've only heard the Musical Surroundings Phonomena II in a dealer showroom and it impressed me as a good-sounding phono stage with lots of flexibility, but I didn't compare it with anything familiar to me. If at all possible, compare it to what you're using now before making a purchasing decision.
The Dynavector P-75 sounded good, but no better than the built-in stage of a Linn Wakonda I was auditioning at the time (comparison made with 10X5 cartridge), and I didn't like the combination of the 10X5/P-75 as well as the less costly Grado Green/PH-1 set.
I've only heard the Musical Surroundings Phonomena II in a dealer showroom and it impressed me as a good-sounding phono stage with lots of flexibility, but I didn't compare it with anything familiar to me. If at all possible, compare it to what you're using now before making a purchasing decision.