There is no "best" hard drive, but there are certainly good ones.
I would recommend a WD Black drive for the best performance in a Hard Drive.
I've pulled a 4TB WD Black drive off of the Australian PCPartPicker.
It is expensive, but is a great choice of Hard Drive.
PCPartPicker part list /
Price breakdown by merchant /
Benchmarks
Storage: Western Digital BLACK SERIES 4TB 3.5" 7200RPM Internal Hard Drive ($299.00 @ PCCaseGear)
Total: $299.00
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-05-06 09:03 EST+1000)
If performance isn't the most important thing, you could go with a WD Green which however has less performance but a better price.
PCPartPicker part list /
Price breakdown by merchant /
Benchmarks
Storage: Western Digital Green 4TB 3.5" 5900RPM Internal Hard Drive ($189.00 @ PCCaseGear)
Total: $189.00
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-05-06 09:03 EST+1000)
I also recommend Seagate's lineup of HDD's too.