Stocking and maintaining a 180g tank is unlikely to be "cheap", jarcher. Your best bet might be to buy small juveniles of whatever species you decide. That way they will be much less expensive and you'll get to watch them growing up.
Let me ask you a few questions first. That might give some indication of how best to advise you.
What kind of filtration are you planning to use?
How much lighting is there?
What is your tapwater like? pH, hardness, alkalinity?
What kinds of fish do you already own?
What kinds of fish do you really like?
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