im thinking on buying Snow Leopard but i cant seemed to get a straight answer from anyone so i though i ask here
so my question is that if i buy Snow Leopard is it the FULL OS install or just a Upgrade from Leopard?

If it is the $29 one then yes it is just an upgrade, if not then it will be the whole OS.

It's only $29.99 for those who are upgrading from Leopard.

The $29 one can do a full install, it doesn't check if you have Leopard or any other version of OSX installed.