I use the RAID 0 on the OS partition (single drive), but that is because we have a nightly full disk backup (for bare metal restore) and every 2 hours we take a backup of the SQL databases and the Files.
As for the RAID 10, I dont mind the cost because it isnt the biggest practice, so we have 4 500GB drives in it. This allows for 1TB of data storage (they are only using about 200GB) and still allows for redundancy, but still gives you benefits of read AND write speeds.
Either way, I feel like Amazing Charts needs a complete database overhaul because no matter what client of mine it is (I manage 4 that use amazing charts), it is always super slow when doing just about anything lol. One of them runs OK, but that is because they only have about 3K active patients, where the slower ones have closer to 16K active patients.