Hi Livebearer_Breeder
I strongly advise against going for a two foot. The smaller the tank, the harder it is to maintain water parameters.
"Ideal" size is 4 foot, however I recommend a 5 foot just to be safe :lol:
Ive heard on this forum that it costs about NZ$8000 approximately if you want to buy all your gear new. If second hand, availablity permitting, maybe around NZ$5000.
Ive also heard that lighting is an important component, and will cost the most in a new setup if bought new in a package. I believe DIY is the best way - Buy your bulbs, make your bulb holders (Bulkheads.. I think they are called, I could be wrong)
And a sump is to keep all the equipment out of the tank, however it is also a great way to skim/filter and heat the tank. Ask some of the more experienced users like Pies and reef.