The move from the Exact MM Cart' to the Aria Pro MC Cart', will undoubtedly bring a new presentation, the Styli alone on the MC, will have a significant impact on how the replay is presented.
Note: Ogura Vital Styli, are quite reduced and really are best used with meticulously Clean LP's, if a typical longevity of usage is to be attained.
I am not familiar with your Phonostage, but can assure you the Phon' in general, as a device, is capable of elevating a Vinyl LP Source to levels of performance that are extremely impressive. The hurdle for the end user, is that there are quite a range of presentations on offer, even from circuits that are produced from quite similar Topologies.
If the usage of Vinyl is looking to be a Keeper, seeking out the Keeper Phon' is well worth taking the time to learn more about. My suggestion is to arrange a few demonstrations of SS, Valve/Hybrid and All Valve, to get to the design that really gels with your unique preferences. From this point on, it is a case of Turnover of experiences of your preferred circuitry, the correct one will be discovered.
So far, no encouragement to spend on equipment, but there is a place where you could direct a little money.
A TT when mounted in a manner that is correcting the impact on it, from the environment the TT is set up in, can prove to be extremely beneficial, and if changing from a usual mounting method, that can transfer unwanted energies to the TT, to a bespoke thought-out mounting method that reduces / isolates the TT environmental impact, the differences that can be perceived in the SQ / Presentation, can be perceived as if there is a New and much improved TT in the house.