Just got hold of a Samsung Galaxy Y Duos B5512 to replace my haywire Samsung Galaxy Pro B7510. This is so I have a phone to use while getting the latter fixed, which incidentally is still under warranty.
Turned the Y Duos on and it shows 160MB of free space. After setting up the first account and sync, the free space dropped to 153mb. This will probably mean I cannot install all the apps that I like. Will be sticking to the essentials: Evernote, Keepassdroid, Dropbox, and HandcentSMS.
Will work on getting it rooted as well so I can run additional programs that can move the apps to SD card to free up the phone's onboard memory.