[infra_red_dude]

Thing is when you select kde/kubuntu-desktop, things like koffice amarok k3b and other heavy weights are also installed. Hence the size blows to 280odd mb! only kde de is much lesser than that. But at least for me its difficult to say whether that 53mb is enough or not. Wait for some full time kde user to reply; post the package name that are listed under the 53mb download.