And if you can afford it, you really should use RAID 6.
The amount of RAID 5 arrays I've seen die during the rebuild process (because one of the other drives, with an equal level of wear of the failed drive, failed due to the increased IO) is non-zero.
If you have the drives, of course. Also try to obtain your drives from different retailers if possible. They have bad lots from time to time. Getting the drives off different pallets is cheap insurance.
The amount of RAID 5 arrays I've seen die during the rebuild process (because one of the other drives, with an equal level of wear of the failed drive, failed due to the increased IO) is non-zero.