linux live cd for extra security has anybody given any thought to that?

I have been thinking on my next round of computers when all my HDs die this time I may just run live CDs. on all my boxes. I am running linux mint now with no problems but got to thinking how much more secure it would be done like this I can download to a flash drive when needed. it would save me the expense of new HDs has anyone given any thought to such a thing mine are all home use net browsing and such. I imagine security would be better this way also. any thoughts pros cons anything I may not be thinking about thanks guys
probly DSL, linux mint and knoppix 3.3 are the OSs I am thinking on using for this purpose

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