If you go full retail, I'd say $30/gal
is not out of line - don't do that. Do what Salttanker said and then you can take advantage of alllll those people who didn't do what Salttanker said.
What they did was see a beautiful setup somewhere and go straight to the lfs
to get all their "expert" advice. Then, after spending about $30/gal
for their setup, they failed, got frustrated and.....(here's where you come in) sold their entire setup for less than 1/2 what they paid.
You can pick up a full tank setup with everything you need for 1/3 to 1/2 the retail cost and, with a good baseline of research and education, be successful and TOTALLY HOOKED!!
Bye good quality stuff, used. Enjoy and good luck