Hi Neel,
As for now at least no recent laptop will actually work with FreeBSD as there's no video support for any kind of recent video chipsets (that is if you want to run X) except nVidia. This includes Intel, AMD (former ATi) while nVidia does provide a driver for their recent card it does however not support dual graphics switching which I believe nVidia calls Optimus. There's a workaround
here but except limited battery performance as the nVidia GPUs are much more inefficient than Intel's integrated graphics and doesn't really provide any better video performance for everyday usage (when you have working drivers).
Workaround is documented here:
https://wiki.freebsd.org/OptimusVideoSupport
Another issue would be Wi-Fi, as far as I'm aware this is pretty much a one man band story for now that includes
adrian@ who does an incredibly good job given the manpower. That said there's pretty much non-existent support for 11ac chipsets irregardless of vendor (Atheros/QCA, Intel, Broadcom, Ralink, Mediatek, Realtek) so except it not to for quite some time. However there's support for some USB sticks with Realtek chipsets but they are single band 11n and perform poorly even with good driver support so I wouldn't really consider it as an option. You have however good support (for being FreeBSD and Wi-Fi) using Atheros 11n miniPCIe cards which would mean that you would need to replace the built-in one as no vendor ships recent hardware with 11n Wi-Fi nowadays. These cards (AR9382) goes for around 15$ off eBay or Amazon (US) and have great support in both Windows, Linux and as good as it gets in FreeBSD.
I have no idea but I guess you can forget about exotic things like Bluetooth or any recent 3G/WWAN card working in FreeBSD.
So if I'm not terribly inaccurately and you're hellbent on running FreeBSD (with X) on a laptop you need to either get a gaming laptop (which really are "plasticky", heavy and noisy) which are pretty much the only ones that packs an nVidia GPU and you'll most likely get a poor TN screen too or a used one. Actually, stay away from any kind of consumer model as they're inferior by far compared to a business model.
Since you were eyeballing the Macbook I'd suggest that you have a look at the Toshiba Protegé Z30 series as they've been getting solid reviews and it's a pretty good bang for the buck.
http://www.toshiba.com/us/computers/laptops/portege/Z30/Z30-BSMBN22
The FHD screen in EU is an IPS panel (you want that) so be sure to confirm that with Toshiba in the US as models can have different hardware. RAM (upgrading) is available at half the price from Amazon (if you want more than 4Gb, nowadays 8Gbyte is considered a minimum) and you can get an mSATA SSD for about the same price as Toshiba offers (256Gb). Comes with Win 8.1 Pro and/or if you prefer Win 7 (at least I do) if you want to dual boot. But as I've mentioned, no X support at the moment and you'll need to replace the Wi-Fi but being a business oriented computer replacing parts is really easy. i3 vs i5 isn't worth it really, you get slightly faster base frequency but its still a dual core CPU and i3 will perform just as good in most cases. Keep in mind that Intel video support is being actively worked on so it'll come eventually.
I have now a 3 gen old version of this and it's very similar with its metal case and everything and it's a nice laptop. If anything I'd wish for a IPS panel instead of a TN one which wasn't available at the time though...
//Danne