A drilled 40 breeder for $100.00 or a 46 bow at full price.
Only 6 gallons difference,I'd jump all over the 40.
The more money you can save on the tank and equipment,is that much more you can put towards fish and corals.
I have a 40 gallon breeder and love the footprint it has...lots of surface area...I paid $99 for a regular tank...if you can get a pre-drilled 40 for $100 that is a no-brainer...go for the 40