We're looking for some advise on what food is best for our 9-week old Holly - it's all very confusing and so many questions! Any advice would be a massive help!

Holly was eating Purina Beta puppy (not large puppy) when we got her a few weeks ago, so we've stuck with that as its what she is used to. But I've been reading up on it today and it looks to be quite poor, mostly cereal (its the first listed ingredient!) and no decent meat content etc.
We're looking to switch her over slowly to another type of dry kibble, which we'll sometimes mix with fresh food when we can and have time etc. We don't mind spending more if that is what is needed to get a decent quality food which I guess is most important in her first 12-18 months when she is growing.
So, should I be looking at standard puppy or large puppy food? She is 9 weeks and 4.5kg at the moment, Mum was a standard Lab and Dad a miniature Poodle.
Is Orijen the best food to go for? It looks to have the highest meat content, but then I've read that it can make her hyperactive having so much protein, and also be too rich? How much protein should I be looking for? I've also read good things about Barking Heads Puppy Days, Green Dog, James Wellbeloved and Applaws - does anybody recommend these? It's very hard to decide which one to go for, and we want to be sure she's getting the best start in life!
Thanks!
Nick, Dave & Holly