Gary-
I went a little gay on the Discount Hydroponics website and picked up all of the GH supplement line, after working with just the 3 basic nutrients for a year. I do think they help, I have had a very obvious and vigorous growth since using them. Floralicious Plus seems to do lots of good, but Jesus CHRIST it's expensive. I don't think I've seen enough growth to justify the expense. I could not say which particular supplement is the best bang for your buck since I started using them all at once.
I use the handy dandy convenient Nutrient Calculator provided on the General Hydroponics website-
http://www.generalhydroponics.com/calculator/index.html
Under '1. Options' I set the calculator at the following-
+Nutrient System- Flora Series
+System Type- Recirculating
+Water Type- Normal (I get an annual water quality test, it's not hard)
+Program Level- Expert (this will allow all of the nutrtient supplements to show in the calculator)
+Feeding Schedule- Aggressive (this will depend on your plant, of course)
+Reservoir size- 5 gallons (check your bucket to see if you are actually able to even use 5 gallons at a whack if you are mixing in your bucket
I mix all my nutrients in one of my 8 gallon beer fermenter buckets (ahhh, beer- is there anything you can not do?) because it actually has volume graduations on it, which is a hell of a lot easier than trying to use the kitchen measuring cups to get an accurate level in an unmarked bucket! Once mixed in the bucket, I pour to whatever level I'm seeking in the bubblerbucket, then leave the remainder for keeping a level in the bubblebucket until it's all gone. Rinse, repeat.