75g is the go to in my opinion and is awesome. The 90g can be difficult to light due to the depth for some people. I see no reason not to spring for the 90g if the price is the same just because the water volume is nice. The downside to the 120 is the 24" width is challenging to light with a single light, so you basically need 2 most of the time. That or a high power light that is raised. I think the 120g is weird looking as a 4 foot tank. The 125 is 6 foot long and matches the other dimensions of the 75g. I really like the length of the tank for viewing. It seems a lot bigger than the 120g due to the 50% extra length.
I'd go as big as you can with the footprint you have available, always. If it is swinging finances, the 90g is great IMO.
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