Best Skimmer...?

[Pier Pressure]

Hi, everybody.

We have a 28 gallon saltwater reef tank that is pretty much maxed out for livestock as we have five fish together with shrimp, crabs, corals, etc.

I am thinking of buying the significant other a really nice new skimmer for the tank for Christmas. So what should I buy? Pros and cons?

I think I would rather get one on the bigger side just in case we upgrade to a larger reef one day.

Thanks for any opinions!