Most people use the common Ocean Free or Xinyou brand sponge filters, they all usually share the same designs (parts can even be interchangeable)... the majority of LFS carry these brands.
Here is an example:
You can also look at those versions which stick on the tank walls with suction cups, they have an adjustable exit nozzle which pushes out water horizontally (rather than just vertically like normal sponge filters), these designs can create abit more circulation for your tank... looks like this:
Photos from google images.
Green Chapter has a new version that has extra compartment spaces at the bottom to put additional bio-media too, quite interesting. Can check those out.
As for air pump... i currently use the GEX e-Air 2000SB (single output) and GEX e-Air 4000WB (double output) for my stock quarantine/grow-out tanks, both have adjustable knobs to tune the air flow rate and are relatively quiet... been using them for just over a year and still working fine.
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