Another problem you would have to figure out is how you would even use the said exchanges without java,flash,etc, and using the machine at all if everything is stored to RAM. You are asking for a bulletproof system, and nothing will ever be 100% secure, nothing.
So, your best bet is to set up a Liberte linux or Tails, or some other live distro (minimal) with persistent data on a USB for your exchanges and such and an offline system/wallet for your funds (unless you have a massive USB drive for the blockchain data) even then, you will need to have copies of your .dat file, because you are at more risk of dropping the usb drive or a failure with it, to destroy your life then you are from using a linux distro, dual booted on your pc, and those "infected" computers around you. Which IMO, is not a risk at all if you have any common sense
.
So, your best bet is to set up a Liberte linux or Tails, or some other live distro (minimal) with persistent data on a USB for your exchanges and such and an offline system/wallet for your funds (unless you have a massive USB drive for the blockchain data) even then, you will need to have copies of your .dat file, because you are at more risk of dropping the usb drive or a failure with it, to destroy your life then you are from using a linux distro, dual booted on your pc, and those "infected" computers around you. Which IMO, is not a risk at all if you have any common sense
.What persistent files would be required? If the live version of the distro comes preinstalled with everything you need (you mention that the exchanges need java, etc.), then it doesn't seem like I would ever need to store anything but temporary data (the operations of the OS in that current session, which is then deleted on shutdown).
Also, what do you mean by common sense? To me it seems like if I never put the flash drive/DVD+RW with linux in the computer while windows is running, and I never access the "infected" hard drive while in the linux session, then I would be fine. That is, so long as some virus doesn't magically float from one of my "infected" computers over my wireless network to linux.
...sorry for all these hypotheticals that may or may not make sense. I'm not well versed in this stuff.
