i love the 10 gallon hands down. one thing i noticed is that there is a plant in "the big kahuna" that doesn't look like an aquarium plant so be warned. you have two of them and they are the ones that you see first. they kinda look like swords. i got something like those from petco and i had to toss them. so just keep an eye out.
the 5g looks nice now also. how is your diy co2 going?