Hey Mark,
To answer your question in short one single drive is definitely better. In long, Raid 0 wont make a difference unless you also have a motherboard & RAM which wont cause a bottleneck. Once you go SSD (assuming you haven't yet) you will find that A) you can never, ever go back to the normal HDDs & B) they are a massive pain to deal with. TRIM is extremely important so research that before diving into anything.
I've gone through about 2 or 3 SSDs in the last year or so, they kept failing on me and it was a really difficult to keep having to install my programs and preferences again and again. However just before the last time it failed, I took a whole image of the drive and stored it elsewhere. When the drive failed, I simply loaded the image back on and volia problem solved. Every 2 months I know take images again and again just incase. I strongly urge you to do the same.
I was willing to put up with all this because I always bought them from a reputable computer retailer, and it was extremely easy to send them back for repairs/replacement through the retailer. They took care of everything! So dont always buy from the cheapest place; plus every time they replace, its a faster newer version of the drive hehe.
As everyone has suggested, DO NOT keep any files you are not prepared to lose on the SSD. I have two other normal HDDs that serve to store everything personal & important, SSD is only for windows and programs. Hope this helps!
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