Welcom future U.S. citizen and new PCMech member.
The best online store over here is by far
Newegg.com. They have more than excellent customer service and really good prices. As for a simple clean silver case, take a look at
CoolerMaster,
Kingwin, and
Lian-Li. I personally like the CoolerMaster Centurion 2 (I have one
), CoolerMaster Praetorian, and the Kingwin KT-424-S. As for the power supply, there should be a switch on the back of yours that will allow you to use it with 110v power. However, if it is not a good quality power supply (take a look
HERE) then you will want to replace it. Either an
Enlight 360w or
Enlight 420w would be a good choice because they are good quality, low priced power supplies that are very higly recommended on these forums. I have two myself and couldn't be happier.