The imacs already have an option for SSD as a primary boot device.
http://www.apple.com/au/imac/specs.html
http://www.apple.com/au/imac/specs.html
Tried to get Tiger but it's now almost impossible to get this old OS. I'll ask one of the service providers because I still have an old Power Mac G4 which is in good condition.
Maybe the new machines will have an option for an SSD? That's why I haven't bought anything until I see what Apple is going to introduce.