I have the Aqueon 8 and love it. My suggestion would be to not buy everything all at once, its 8gallons total, but you have to subtract the back compartment so your fish has closer to 6gallons worth of space. I made the mistake of buying things left and right and ended up not using half of what I bought because they made the tank too cramped. The outflow is strong, but I just bought some aquarium sponge and rubberbanded that to the outflow spout. i also recommend wrapping the pump in a similar sponge as its vibration does make noise, to the point that its highly noticeable in a quiet room.As to dividing, I dont recommend it as the space isnt all that big once you factor everything in, but that's just my humble opinion.
I use the Carabsea ecoComplete substrate and love it... If what you want is of similar quality, then you'll be fine.
I cant comment on the heater you provided but if its adjustable, then it should be okay. Do some more searching for reviews if you absolutely have to get that, but if you can buy others, I recommend the hydor adjustable heaters... Really good quality!
Last edited by DiiQue; 04-10-2013 at 10:25 PM.