Thanks Phishie!

From your opinions and others that this is my starting updated list:

-go freshwater
-get a 30 to 40 galon tank [dwarfs are ok for now]
-get a filter
-get water conditioner / primer
-get an aerator
-get heater
-get water test kit
-put it close to a sink/water hose
-put it on a sturdy table or stand
-cycle
-get fish food
-get fish: cichlids seem to be a good option

I am inclined to buy everything new, even if it is more expensive, I'm a little affraid of getting defective.

This is how I would like my future fishtank to look like:

http://fishpetlove.com/ ==> see the tubular tank?

A bit fancy and probably very expensive... well I'll just have to get rid of one of my private jets...

A fish tank in a plane... now that's an idea!