Also, I could get a 185, (96x18x25) so would you still recommend the 180 over it, or do you think the 8 foot length would be beneficial.
So get this is you don't plan on having fish that don't get past 10" in total length, more tank length is generally better. You can run 2 canisters like an eheim 2217 on tank this size, 3 if you want. People tend to say FX6, but what they don't tell you is how big it is, and how heavy it is when filled with media and water. It can become a problem moving this big thing (FX6) around when servicing it. This is why I choose the eheim 2217 or similar in size canisters.