Mac Mini Server SSD

Hello

I'm planning on doing some upgrades to a late 2009 Core 2 Duo 2.53Ghz Mac Mini Server which is getting a little sluggish on me. I'm running Snow Leopard Server on it, and it is used in a network of about 8 computers which access a filemaker pro database on it and a shared drive which is hosted on an external drobo unit.

In adddition to maxing its RAM (from te stock 4GB to the max 8GB) I was considering replacing the stock 500GB HDD with an SSD. My question is about the redundancy back currently setup via RAID. I don't need a huge amount of space on the internal drive, I'm using less than 15GB at the moment and have no need for expansion as the file storage is all on a drobo. So, internally all the drive does is host the filemaker databses. I was planning on buying a small SSD, like a 64GB, but was thinking of only buying one drive. Using it as the startup drive, and instead of RAID 0 for safety and backup, clone the primary drive to the secondary stock 500GB drive with carbon copy cloner or time machine or some other function.

Or, would i just be better off springing for two SSDs and putting them in a RAID 0?

thoughts?