Mac
It is great as long as you stick with Leopard. I am running 10.5.8 and it is very stable. I tried Snow Leopard and got kernel panics, so after a week of that, I reverted the system back to 10.5.8. I’ll upgrade to Snow Leopard when they come out with 10.6.2 and upgrade the kernel beyond 10.0.0.
Apple products are great but expensive.