Mac's aren't double the price by all means, just cause a laptop has the same processor and ram doesnt mean its the same, macs come with a lot of extra things which spec them up like the multi touch glass trackpad, bluetooth (ambient light sensor for screen which auto adjusts brightness and backlit keyboards on the pro's) and OSX is an amazing operating system. (even on a hackintosh)
You can run windows natively on the intel macs, runs really well - i had it for games until it started getting on my nerves!