cost is a factor for most people, like it is for me. no one wants to spend more money than they have to to get quality nutrients. that being said stay away from advanced nutrients, their whole lineup costs $300+, some of their addon nutes like "B-52" are nutrients that aren't even needed by the plant because it produces vitamin B naturally and yet it costs $49.95/qt. in some grow stores.
I used advanced nutrients early on and was impressed no doubt, my friend uses it religously and has all the additives and the full lineup. I used it for a while but when I had to go buy my own I got sticker shock. Some research on these forums lead me to DynaGro which is endorsed by millions of growers worldwide and has been around for decades in the botany industry. The best part is you can get a full nute line for 5-6 grows or more for under $80. has all the macro and micro nutrients the advanced nutrients line has but without the price and a whole lot less bottles to mix. check out youtube videos on AN vs DG grow-offs and you will see in every single one the DG nutes win by volume. I've done the test myself and am now a believer, DG all the way!