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I would go with the bio cube 8, its kind of pricy but you have the ability to retrofit it with a MH in the hood if you want. I like the fact that you have the ability to use a closed hood and have a MH in it . I might do a nano cube 6 project like that when i have time.
mabey i can help, so can other members, what are you planning to keep. We can make a decision on what tank you should get. Nano cubes have noisy fans...but other then that 1X18 watt lighting isn't that much if u are looking to keep other high end stuff.
cad lights is having a special...If you want an enclosed fixture go with the nano cube. If you don't have a pref go with the cad tank. http://www.cadlights.com/product_info.php?products_id=35
then again bio cube 8 has lots of room for DIY stuff..Like i said its what you want to do. Nano Cube 6 are around 130$. You might find them cheaper on ebay like a used one.. Good luck