Personally I use General Hydroponics' FloraNova series plus the cool enhancements and stuff they offer. Starting this year I have also been using a few things from Humboldt Nutrients that seem to be helping a lot. As always I add the Beastie Bloomz toward the end.
I use:
General Hydroponics FloraNova Grow 7-4-10
General Hydroponics FloraNova Bloom 4-8-7
General Hydroponics Floralicious Plus 2.8-0.8-0.02
General Hydroponics Liquid KoolBloom 0-10-10
General Hydroponics KoolBloom Powder 2-45-28
General Hydroponics FloraNectar Sweetener 0-0-1
Humboldt Nutrients DeuceDeuce 0-0-22
Beastie Bloomz Powder 0-50-30
I used to use the whole Fox Farm line (I still use nothing but Fox Farm Ocean Forestas far as soil goes) and I liked it fine but this GH FloraNova stuff is wicked. A lot of people tell me I use too much stuff, but my philosophy with nutrients is give 'em as much as they'll take. If it starts to burn a little bit, just flush the hell out of it and give it a tiny bit less next time. Its like if your pouring yourself a glass of juice of something when your really thirsty - you want the glass as full as possible without spilling. If you do spill (burn the plant) then next time you pour a little bit less. I'm pretty sure that analogy makes sense...