SSDs would indeed be much faster than conventional hard drives, but a word of caution on not only the price, but also be aware that they would probably have a much less number of write cycles compared to conventional drives. Just be because they have no moving parts, does not necessarily mean that they are going to last longer. Many high speed read/writes can quickly render the device unusable, and replacing said drive will be even more expensive since SSDs are priced higher, and plus also probably do not have as much capacity as a conventional drive.
I think in the long run of things, you are better off using a conventional drive, particularly in a RAID configuration. That doesn't mean that you can't use a SSD in a RAID configuration, but you have to consider that so many read/writes will kill the drive much quicker, and is the speed really wroth the price and replacements over time? I guarantee you that you will be replacing those SSDs more than you will a conventional drive.
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