If you have the space and $$ for a floor-mounted unit, then that's what you should get. I have a 10" benchtop and it's very lightweight.
If you don't think a floor unit is worth the expense, pick up a 10" for $100 or so on sale and upgrade to a floor unit when the time comes. Then again, if the time to upgrade is soon, you'll be kicking yourself for wasting the $100 on the bench model. However, consider that 10 years from now, you'll probably never regret buying a floor model as long as you always have the space for it.