The best sounding linestage I know of is the Emotive Epifania with the latest upgrades. However, I hesitate to recommend that you try it because a quick review of your "system" suggests that you need to spend more time trying to optimize the sound of the equipment you have rather than just buying something new. ANY piece of new gear requires a careful investment of time to bring out its best. With the rapid turnover in your system during the past few months, I don't believe you have taken the full measure of any of your gear. Sorry if that sounds harsh but that's the way I see it.
Dave
Dave