Depends on how resolving your system is. I built a custom bucking transformer some time ago to reduce over voltages coming into my home. Unit was built to audiophile standards, with high quality transformer,matting to minimize vibration, emi/rfi shielding, quality internal wiring, oyaide R1 ac outlet. Only my Art Audio Carissa Signature 845 SET amp was plugged into this.
Eventually, over voltage coming into house was eliminated, bucking transformer eliminated. Immediately, I heard superior transient and micro dynamic presentation. It may seem counterintuitive to think a transformer would decrease sound quality, after all, they're used in much of our audio equipment, still, I hear this degradation. In my experience, transformers on AC lines have degraded the performance of all my tube amps, push pull or SET, high powered or low powered. Same degradation of transients and micro dynamics on every amp. This also goes for all transformer based power conditioners.
I'm not alone in hearing degraded transient response and micro dynamic loss with power amps on transformer based power conditioners, some have issues with macro dynamics as well. Some may blame other components within transformer based power conditioners as the culprit, specifically capacitors. Well, I've upgraded caps within these pc's with the best highest voltage capacity film caps, still hear the degradation.
And then, most of these step up, step down transformers you see are not near audiophile quality. And so, while one may save much money buying other countries' domestic market products, a quality transformer will minimize or eliminate any cost savings, and could possibly increase expenditure.
I had thoughts of doing same thing you're contemplating some years ago, some pretty substantial savings to be had, Line Magnetic amps and Technics SP line of turntables come immediately to mind. I wouldn't purchase any amp in this manner based on above argument. My issue with non-amp equipment is the mostly cheapo step up/step down transformers, and the warranty and service issues. If new product, good luck with that, used, I doubt any tech will work on it. I do see a single instance in which I would purchase in this manner. Lets say you have a certain magical piece of equipment not available in US, big buck purchase, you can find a US tech's assurance they'd work on it if any future problems (or assurance of country of origin tech), don't care about warranty if new. You have the ability to diy audiophile step up/down, or find a tech to build audiophile quality step up/down, or find one off shelf (good luck with that, I never found one when building my bucking trans). I'd say go for it. For myself, I'd always wonder if I was losing some performance potential on any equipment other than amp, amp no way. Still, may be worthwhile if you find that particular magic item. None of this hassle worth it to me unless it is extremely costly and unique piece. We've got plenty of special equipment available here, why go this way, trying to save a buck is not a reason to do this.
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I'm only giving this long winded answer as I've contemplated doing same as you. All the above, and more have dissuaded me from pursuing some pretty amazing deals. If you don't believe me, ask yourself, why aren't more doing this, I presume they've come to the same conclusion.
