I'm a huge fan of Windows 7, but Windows 7 was clearly not designed for a pure tablet experience. These things are going to sucks terribly with Windows 7 installed on them. Also, half the reason Android Tabs and iPads make great tablets is because they have an App hub that's full of applications designed to work for a tablet.
With only 16GB of internal storage that is going to have to be a very slimmed down version of Win7. Running Windows is pointless unless you have some space left over to install programs like office, etc. Besides that, that 16GB will probably need to be partitioned to give Android and the associated apps some room too.