Ask Slashdot: GNU/Linux Laptops?
"I'm an OS X user looking to switch to a Linux laptop. I like the Unix/BSD aspect of OS X. Simple things like when I close the lid the laptop goes to sleep, the sound card works out of the box, long battery life, minimum cooling fan noise, and a comprehensive but relatively straightforward backup system and 'AppleCare' package are important to me. What all-inclusive model of laptop and distro would you recommend?"
He didn't mention it, but I am presuming that working Wifi should be on that list too.
http://www.system76.com/
System76 is the closest your going to get to a Apple experience with Linux.
Pre-installed so you don't have to muck around with drivers
Comprehensive testing and configuration of the hardware by professionals.
Support and documentation.
Company officially supports Linux.
Provides custom driver bundles to make upgrading effortless as possible.
etc etc.
You will get NONE of those things if you go with a Windows system from a large OEM and then try to install Linux on it yourself. You will be your only source for OS support and hardware configuration. You can have Ubuntu forums and mailing lists, but to be honest the chances of you getting useful answers is about 1 in 4.
Ubuntu has a list of Certified Hardware for ya. But I have yet to get a Thinkpad at least 90% running. I don't have the fingerprint reader on my X200s working with Fedora but everything else works, including the dock. The boss's Thinkpad T520 runs Ubuntu and has everything working except audio through the dock, but dual DVI displays on the dock do work.
Of course once you get a laptop working expect updates to constantly break things until you just get tired of rolling back failed updates and just stop, only taking critical security updates you can't live without.
It is worse with Linux because almost no OEMs are involved in keeping it working, most aren't even involved in initially getting it going so folks have to guess. But raise your hand if you haven't had to roll back a driver or update on that 'other' popular OS. Last week I had to roll back a mouse driver on a Dell laptop to get the pointer working.
Democrat delenda est