You have inherited a very nice system and I believe your correct in not wishing to replace components. Take advantage of the gift given. Get to know what you have, put your money into the music. You are wise not to spend on a TT until you know that is a source you wish to pursue. A quality TT setup is expensive and requires a considerable knowledge base to do right.
Continue to explore options regarding digital sources. I would be hesitant to replace the Arcam/Mani combination until I had a clearer picture of how I might take advantage of digital audio.
Continue to explore options regarding digital sources. I would be hesitant to replace the Arcam/Mani combination until I had a clearer picture of how I might take advantage of digital audio.