Go with the 220 volt outlet and make up a new power cord with plugs that are adaquate at both ends. Many Europeans who move to the US use all their equipment this way with no problems. Many believe 220 sounds better.
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Any electrician can install a dedicated 220V line and install a Shuko wall outlet. All you need is the room in your AC box to accommodate the circuit breakers. I don't know the rest of the answers to your questions however it's very basic electric information. I'm sure other members can answer the remaining questions.
15 amp 220 lines are used in the US and have a standard NEMA (National Electrical Manufacturer's Association)confirmation different from the Shuko. Larger window air conditions commonly use this configuration plug. Any licensed electrican can install this code compliant circuit. Possibly an issue is whether the amp is setup for 60 cycle power. Best to check with the manufacturer on that.
I suspect you may wind up going the transformer route. If you do, the amp may be starved for current on peaks if the transformer core is too small. To avoid this, get a tranny that is larger than the load seems to require. Two or three times larger is not excessive. In exchange, the extra isolation the transformer provides will help to quiet the background and enlarge the soundstage.
An update ....... A technician who sells European plugs and outlets informed me that I should purchase a transformer to convert from 220V to 120V. I was told European or overseas power has only one phase as opposed to USA with 3 phases.>>
Houses in the USA are fed from a utility power transformer with a single phase, split phase, secondary winding. 120/240 volt nominal grounded ac system.
The 240 volt is single phase that being 2 hot conductors. Have you heard of balanced power, 60V - 0V - 60V, isolation transformer systems? The secondary of the balanced isolation transformer is a split phase winding. The secondary winding is center tapped in the middle of the winding, thus split phase. The center tap is connected to earth ground. Well that is exactly what is done with houses in the USA. 120V - 0V - 120V, the center tap is connected to earth ground and becomes the grounded conductor the neutral.
Most European homes electrical power is single phase 240 volt nominal grounded system. One hot ungrounded conductor and one grounded conductor the neutral.
There are rare pieces of audio gear that don't like split phase. Most have no compatibilty issues and European gear would be even less likely to have problems than American because of international standards.
All electric stoves and dryers use 240V (+120/0/-120) in US/Canada. The two hots are 90 degrees out of phase (inverse sine wave) and cumulative. Oddly, this is still, most often, called single-phase. The neutral only carries the difference ("garbage" for a single load) between the hots. 3 phase is used in industrial/commercial motors where three hot 115V, or more, at 60 degrees phase add up to 208V, or more. 3 phase has no neutral and, sometimes, no ground.
An adequately sized transformer would isolate and filter AC and often sounds better. They're not that expensive, if you know what you're looking for. It only has to reproduce a very narrow 60 Hz bandwidth. Converting from 60 Hz to 50Hz is usually not necessary for audio gear.
Hawaiikid, you will notice I did not give a position one way or the other what you should do. As for Hawaii I only assume your ac power system is like what we have here in the lower 48. You stated the equipment you were interested in is 220V. What is your Line to Line, L1 to L2, voltage in your residence? You will notice for the voltage readings I gave for my examples I used 120V and 240V "nominal". My L1 to L2 measures 247V, Line to neutral 123.5V, in the evening hours.
If you decide to install a 240V branch circuit you will need check the actual L1 to L2 voltage before doing so. What is the voltage tolerance of the 220V equipment? + or - ?
If you decide to buy a transformer make sure it is large enough as others have posted here.
You have two choices to make for a transformer,
A step up autotransformer 120V to 220V nominal. The cheaper way to go. In this case no isolation from the Main Line power.
Or a step up isolation transformer 120V to 220V nominal. Best way to go but a lot more money.