I'm partial to Pioneer and JVC, but there's also Kenwood, Sony, and Alpine in the top tier category. Jensen, Boss, and Dual are cheaper mid-tier options, but may have lesser features and durability. Each brand will have a wide range of options for most budgets. Crutchfield.com is a great resource for helping you narrow down your options, but I think they are primarily a US based company. If you are from outside the country, they would still be a good educational source and then you can buy locally.