The electrical work shouldn't cost that much money, trading down will defeat your whole purpose. My first inclination remains over- voltage on your AC is causing at least some of your problems.
You are part of the way there already with the one dedicated line (if this is wired up comprehensively). You do need to properly ground this line, measure for dc offset, voltage and check for all the things Al mentioned, the measurements and check out should cost very little. Only after determining whether these are issues should you proceed further.
You could also borrow a power conditioner from the lending library at the Cable Company, shipping is the only up front cost. This should tell you something about the quality of your power.
I don't know about your knowledge base or handy-man skills, but DIY saves tons of money. I did all my own wiring after gaining requisite knowledge. Eventually, you will find every single inch of your power delivery system is critical. Everything from power in to your house to delivery into IECs on equipment is subject to improvement. One of the biggest payoffs in audio.
You are part of the way there already with the one dedicated line (if this is wired up comprehensively). You do need to properly ground this line, measure for dc offset, voltage and check for all the things Al mentioned, the measurements and check out should cost very little. Only after determining whether these are issues should you proceed further.
You could also borrow a power conditioner from the lending library at the Cable Company, shipping is the only up front cost. This should tell you something about the quality of your power.
I don't know about your knowledge base or handy-man skills, but DIY saves tons of money. I did all my own wiring after gaining requisite knowledge. Eventually, you will find every single inch of your power delivery system is critical. Everything from power in to your house to delivery into IECs on equipment is subject to improvement. One of the biggest payoffs in audio.