This all really depends on what YOU want. You could have a FO, FOWLR, or reef tank. If you want just fish, then I would get perhaps a pair of clownfish. If you want fish with live rock, you could get a fish or two and some inverts. Reef systems require a lot more work since you'd need proper lighting and more specific water parameters. Soft corals are the easiest of the corals to take care of because they're usually hardier than others. They also require less light.
What exactly are you looking for in a tank? Do you just want fish or would you like corals and other things as well? It would help us help you if you were a bit more specific. =)
As for a filter, I would choose one that's within your budget. Usually, if it's more expensive, it is of higher quality. Many people use Whisper power filters with no problems. They aren't too costly and seem to get the job done.
-lefty