The initial cost is a lot, unfortunately. Usually the babies are anywhere from 800-1300, depending on the breeder. Then you have to find the right cage-I have heard many people on here say that you should buy the largest cage that is within your budget, and I think that's pretty good advice. There's also deciding what kind, if any, playstand(s) or tree to get, etc. It all adds up pretty fast at first. That being said, the maintenance cost is relatively low, I think. She will go to the vet once a year for a wellness checkup, and besides that now all we have to buy is her Roudybush pellets, veggies (etc) for her to snack on, and toys to rotate into her collection. Like any animal, it can get pricey if they get sick, but I have spent a small fortune trying to keep my 13 y.o. Greyhound going, so I don't see it as being much different. We started slowly buying Chickie's things as soon as we placed our down payment. We got her cage off Craigslist and her tree from Ebay, and both were a pretty good deal. All that being said, she is now my priceless girl and I couldn't imagine my life without her.
As far as responsibilty goes, I found that most of Chickie's needs are met right along with the other furry kids in the house. In the am and pm when the dogs and cat are fed, I also check her food level and water in her cage and on her tree and clean/refresh them as needed. She really isn't any more work, in my opinion, than I already perform daily for the other animals. If I notice that she has dirtied her water throughout the day I will of course clean and fill it then too. I clean her cage and tree papers when I clean the litter box. When we eat dinner she usually eats with us, and whenever we walk by her tree and have food we usually offer some of it to her-in an attempt to try to keep her always "trying new things." Whenever I go grocery shopping I just try and grab a new fruit or veggie, baby food, etc for her to have as a snack and that seems to work pretty well. I think a lot of the "responsibilty" of having a grey lies in being sure that you are an informed owner. I am new to greys, so I am still constantly reading everything I can so that I can be a good mommy to her. It sounds like you've really done your homework though, and that's the best kind of mom a bird can ask for.