If you have the time to go through my grow from mid way to the present you can see what 2 part Sensi Grow A & B and Sensi Bloom A & B can do. You can get 4 Liters of Grow A/B for $60 on ebay, same as Sensi Bloom A/B.. So for $120 you'll have enough to last probably 2 or 3 grows using solid nutrients as long as you're not filling gigantic reservoirs...
I also used Big Bud and Overdrive. While I would not say having used those two entirely created my result, overall I'm more than pleased with the 2 part systems. You're going to get a lot of opinions, pick whats best in your budget. AN might have solid marketing, but they also have a great product too. As a controlled test (or as close as it could be for me) I wont be using Big Bud or Overdrive on one of my current tubs compared to the other just to see what the differences are.
If you don't view my thread.. basically I ended up with 4 plants and after 2 weeks of drying & curing am left with just about a pound. Your mileage may vary. See my journal for strain & grow conditions info if necessary.
Hope that helps.
