Non-current limiting power conditioners

I could see spending $400-$500 on a nice used conditioner

This could get you a new APC H15 conditioner that is rated around 1.5 KVA and which as been tested to ensure it can deliver high current to power amps and UL rated to boot. Although this APC is an industrial pengineering company used by IBM/Sun/Oracle/Google and many others for data servers - this particular model has been deliberately designed for audio applications. Apparently they saw a market niche where profit margins are very high and all they had to do was reconfigure their design. Since they manufacture huge volumes of these power conditioning devices for industry I suspect you get amazing value that would not be possible if they just served teh audio market.

Care buying a used Power Conditioner is urged. The MOVs, Metal Oxide Varistors, used to shunt power to ground can do so only so many times than are 'worn out'. I would tend to avoid a used conditioner, except perhaps, in the case where NO surge protection is provided.
Other surge protection schemes, like a whole house unit, may have a better lifespan.

Hi Nissan- take a look at the Furutech E-TP80. This is an exceptionally good 8 outlet power conditioner that does not limit current, is well made and is very reasonable in price ($500.00 new). You should be able to try this at home from someone like the Cable Company that offers home auditions just to hear if it meets your needs.

I agree with Magfan, when purchasing a used conditioner with protection, the MOV's do wear out over time. So I would either look for a used conditioner with NO surge protection or buy a new one with surge protection. In your price range, you should probably consider a new Monster EP3650 or a Tara Labs AD/6.

Personally, I'd go for the Tara Labs AD/6, which IMHO sounds better. However, Monster does a great job standing behind their product. I shipped a HTS3500 once, and it was damaged in shipping, Monster sent me a brand new one....no questions asked.

Cheers,
John

FWIW, Several of the suggestions do not regulate the output voltage from main
swings like the APC H15 does. This means if power sags during heavy loads or
when your AC comes on then these devices will not boost the voltage output to
compensate. Sagging voltages is one of the reasons that electrical equipment
can end up having a short life - in some cases it may even affect performance.
(The H15 is actually the basis for a Rotel conditioner RLC-1040.)

Why spend $500 just to get a glorified power bar with MOV's and filters when
you could buy something serious (even at this entry level price).