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I always recommend using the largest standard aquarium that you can fit in the stand and installing your own glass baffles. This way you get exactly what you need, can have whatever skimmer and pumps you want, and can customize it as much or as little as you want. It is nice to be able to change your sump as you and your tank's needs change.
If you're handy, consider DIYing a sump. With an old tank, some glass, silicone, and a little ingenuity, you can make a custom sump to fit your specific needs.