If you want a really nice hackintosh laptop with good build quality and great performance for the money you can't go wrong with this:
A second hand i5 HP ProBook with 4GB RAM. £126. Add to this a 120GB Samsung EVO SSD for £55 from Amazon, and a £6 wifi card from eBay. Less than £200 all in.
Everything works out of the box on this laptop except the wifi, which you have to replace (or use a USB adapter).
I configured one last week. Mavericks runs perfectly. Quartz Express, Sleep/Wake, all works.
I bought a used Dell Latitude E6520 because it was the only laptop I could find with a reasonable price that had a good full HD screen.
As a bonus, it has an i7.
I didn't want/need discrete graphics because hackbooks don't have discrete graphics support (yet?). The only thing I HAD to replace was the WiFi, but I upped the RAM to 8 GB. Other people have upgraded to 16 GB with no problems.
The catch is that I specifically found known-good laptops and then went and bought one. Ditto for the wifi card.