In my opinion Bio cubes are an awesome all in one tank. The have a few compartments in the back one for a return pump, one for bio balls and such, and they also have a spot for a filter pad. Plus you can get foam blocks to put by the intake in then you have a shrimp tank.
The lighting is also pretty great for an all in one tank. two 32 watt power compacts. That's enough to grow a fair amount of plants.
-the built in filtration system is not that good unless you modify it.. i'll send you the link when i get to a computer..
-it comes with an actinic blue bulb that is useless for photosynthesis.. and a 10k 24watts bulb, that is way too much if you don't match it with co2.. cause if you don't, staghorn and BBA will be a common friend.. most of the plants that i have, had grown vertically due to high lighting..
most biocube owners i know changed the top, and i'm on the verge in doing so.. which is another $59++..
and yeah, if you want to change the bulb with 67k will cause you around $13 + s/h..
don't get me wrong, i love my tank.. but if could do it all over again? i'd go a different route..