You say solaris gives 5x9 (which they dont guarentee on their mid range) but that Linux does not.
You then try to restrict the Linux side to Intel hardware, while thats not the hardware solaris offers. While solaris does support the x86 arch they dont guarentee 5x9 on it.
I point out for a cost (and a big one) IBM will support 5x9 on the Linux intel side. The problem is you have to hand them the keys, I dont have root on our production servers. I make changes in dev/test and pass on the instructions to IBM. I point out an article about a company teamed with IBM running a 5x9's linux intel server.
I also point out that solaris on sparc can be as expensive as Linux on a mainframe (IBM has come down in cost on their Mainframes lately).
Dude youre losing this one, let it go.