Power Conditioner Advice please...


I would be grateful for advice from the forum with regard to the following:

My system sounds significantly better in the evening/night than during the day and given that I live in a busy commercial area it would seem likely that I need to clean up the power. 

Ultimately, I will buy an AC regenerator but do not currently have the budget for that. I am therefore looking at a power conditioner and which I hope to buy pre-owned for under $/£1,000.

Given my amps draw a large wattage (peak 400w into 4ohms) I am nervous about placing a conditioner between them and the mains.

The other components:

1.     Auralic Aries - has its own external linear power supply.

2.     DEQX  -  “Nine separate power-supply regulation stages  including four that provide the main analog rails deliver extremely low measured distortion....

Where do you think I would be best to apply any power conditioning?

Any other suggestions welcomed.

Thanks very much

soma70
For obvious reasons most people will not want to bring an industrial transformer into their home, no matter the difference it makes. Commercial audio solutions are more appropriate for most people.
I have a PS Audio P5 which I am trying in place of a Blue Circle conditioner. So far I prefer the BC unit.
I use the Burmester 948 Power Conditioner and it suits my needs. The power cable is the  Burmester supplied one and have replaced the connectors with Furutech NCF connectors. 
My Pre, Power and CD/Dac are pure class A.