Who does both Linux and commercial unix

We run a large-ish shop with primarily risc machines running a commercial unix. Some of the servers are quite large (and need to be) and need to stay on the commercial unix. We are considering moving the smaller machines to intel/linux to save money.

But will we *really* save money? Isn’t it more expensive to support two *nix’es? Is the cost per useful mip really lower on intel than risc?

It doesn’t seem that linux yet has the detailed system level tuning tools we can get for the commercial unix … or have I missed something?