The MacBook is the latest and greatest for casual and stylish computer users. It comes in 4 colors: Silver, Space Gray, Gold, and Rose Gold. It's super light weight and has a beautiful retina display.
If you already have a keyboard, mouse, and monitor, the Mac mini is the least expensive entry point into the Mac ecosystem. If you don't already have those items, a low end iMac will give you more bang for your buck. A lot of businesses use Mac mini computers as servers.