I have the red sea max...... I am very happy with it.. I was in the same dilemma as you are.. you can see pictures of it here..
http://s129.photobucket.com/albums/p...scs/Saltwater/
It's an all in one.. it's ALL glass.. 55lbs.. heavy tank.. but.. comes with protien skimmer, good lighting (T5 PC's), heater, the lid has arms.. that holds the lid up for cleaning etc.. all the componants plug into a hidden power bar.. which makes it one cord for everything.. all the cords are hidden.. and it has switches on the side to control power to all the components.. built in timer for the lights..
The lights that the RSM comes with is definitly better than the biocube.. and
if you plan on keeping a reef tank.. you need to consider the lighting.
Also the back of the tank on the RSM is tinted glass vs, biocubes which are plastic material ... and coraline algea is REALLY hard to get off of it if.. i had a 12 gal nano.
the only cons.. I had to buy a chiller (depends where you live, my house gets really hot in the summer), but.. any cubes are known for getting to warm because there's no where for the heat to go.. I've also had to put an additional power head on the tank for water movement.
I'm sure i'm missing some more pros.. I'm very happy with my RSM

Good luck!
Sarah