Personally I'm a botanicare loyalist.. Botanicare can do no wrong in my books. No PH problems.. all organic.. no problems in my experience, so I just stick with it.
Other than that i've only used Humboldt, which IMO is very expensive and from my experience didn't really impress me.
Otherwise, i would probably recommend AN of course (who doesn't), and Earth Juice. Earth juice for the price is probably about as good as Botanicare.. if for some reason Botty suddenly went outta Biz then i'd do the EJ.
I can count on 2 hands how many plants have been DEF since using BOT lol.. its just a great complete nutrient.
FYR , my regiment is - Pro Bloom, Pro Grow (make sure its PRO), Karma, Sweet Berry. Thats bcoz I'm broke right now lately, if i had the extra money of course i'd have some kinda xtra ferts like AN big bud or Botty's Blastoff. IMHO though not using it the last 2 harvests hasn't really made me cry either. The CalMag is a must too if you want to forgo the Karma..
The only other thing i need to try next would be their aquashield.. i currently use Hygrozyme and like it so i stick wit the zyme!