Samsung Galaxy S3 has good specs .. Even i m thinking to have one.. You can purchase it from Amazon or ebay which have good deals now.. My wise advice is to get a locked one and get it unlocked from any commercial vendors online like Unlocking4u.com coz unlocked phones will cost fortunes it will end up in paying a couple of hundreds of dollars

Samsung galaxy will do a good job... even i replaced my Nokia with it which i initially had to unlock with other carriers..that i did from a site called http://www.simpleunlocking.com . . If you want get this service from them