Space needed for a lil more than basic Ubuntu installation

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http://askubuntu.com – I know my question is lil ambiguous so let me elaborate. I will want my Ubuntu to have the following a) JDK 7.0 b) Android Eclipse IDE c) Some basic video playing programs (like VLC) d) Shell utilities (Not sure.. but I believe some of the utilies need to be downloaded) Does 30gb space allocated in my Windows Laptop sound reasonable to achieve this Ubuntu installation (dual boot option) ? (HowTos)