you can get by pretty cheap if you play your cards right. If cost is a factor then you're going to go soil.
You're looking around $100 for nutes if this is going to be a long grow (roughly). You can get pots really cheap, its 1 gallon size per foot.
If you keep your eye out on craigslist or ebay you can find cheap MH, HPS or conversion lights. If you want and heat is a problem you can always veg with CFL's and even flower with CFL's. Flowering that many plants is kind of a waste of money as you can buy a mh or HPs and spend probably less money in the long run.
You can vent with PC fans or you can buy the bigger better types of fans. Read the growFAQ about ventiliation and ways you can do it.
Nutes, I'd recommend Tigerbloom for soil, though never have used it but I've read nothing but good things about it!
All in all I'd say look at spending $400-600 if you play your cards right, for a good, succesful grow. Look at it at an Ounce of some really good to grow your own shit! Perfect investment!
Good luck with everything and be sure to read the GROWFAQ and read a lot of pages before you get started. If you could rep me for the help that would be cool too
Hope everything works out great for ya!