aquarium construction preferences?

[Friendly]

there are a few variables for aquarium construction now:

- standard glass or low iron glass (this is almost a no-brainer for low iron due to the crystal-like view)

- tempered or non-tempered (depends on whether you want your tank drilled for a sump)

- rimmed or rimless (the clean, asethetic, modern look of rimless is all the rage, so seems a no-brainer as well)

- square edged vs. 45 degree edge (45 degree edge doubles the cost of aquarium construction...is it worth it?)

- silicon sealant colors like white, black or clear (makes a statement, creates atmosphere, modern 3 dimensional look/impression)

 

what other aspects did I miss? 

what are your preferences based on the options listed? 

[conradj5]

Glass thickness as well. I prefer to go with 3/4" ever for smaller ~40 gallon tanks, makes me feel more secure. I don't like how thin many tanks you could buy at pet stores are.