Granite counter with no vanity?

Great site!  I'm remodeling a 1/2 bath and want to replace my vanity with a small (22"x30") granite slab with a semi-recessed vessel sink.  Would love to do away with the vanity & get the look of a "floating" slab, but obviously have the issue of supporting the stone/sink.  Would use a permanent ledger on the left side and rear wall, and some angle-iron or support brackets.  Is this feasible or do I need a support post in the right front corner?  Thanks!