Someone can do it on the cheap if they are willing to go used. I got a furniture quality stand and hood, 55 gallon tank (scratched but still decent), 5 t lights, skimmer, sump, ATO, and heater for 375. She offered me some powerheads but I wanted koralia. My rock I got for 3 a lbs craigslist find compared to 6 LFS
price and the sand I got for 1 a lb. You can't be in a hurry to get it started and once you get it started take your time. I might have been able to get the skimmer and part of the ATO for the price I paid for everything. The plumbing I had to get because I think she kept the hoses to use on her new tank.
Your big cost will be lights, filter and powerheads keep that in mind when setting up your tank because these are things you don't want to skimp on. Keep in mind the cost of replacement bulbs, you might get a heck of a deal on compact fluorescent but t5 is the better choice just because of the price of bulbs.
Do a lot of research and see if you can really afford to go new with everything or if it is better to used on somethings to use the money for the things you really want. Once you get your tank set up you can do it for the budget you set aside but I warn you there will always be "it would be nice to have or an I want". My I want now is an ATO for my JBJ nano in my living room
I can afford new but I want to get used so I can get me another one or 2 maxi mini anemones.