Coming from someone who used Bellamy's Organic for 6 weeks, I'd highly reccommend it. It is a bit more expensive due to the fact it's organic, but it even smells more appetizing than other brands.

I've had to change to Karicare HA/AR formula as my then 6 week old was demanding 200mL plus EVERY feed of normal, unthickened formula, as he wasn't getting full enough.

As everyone has said, it's all a bit of trial and error.