There wil be NO PROBLEM whatsoever when using 110 gear with a transformer on 220 and vice versa! Here in Germany a big electronic chain store sells transformers from 30Watts to 1000 Watts for low money (the 1000W unit is around $200) doing the transformation BOTH ways. My entire system is American - hence 117 Volts - and I run it on German 220V: the digital front end at a PS Audio PS300, as mentioned by Rsuminsby, the rest via transformer.
Good luck!
Good luck!