I've had quite a few rabbits, just got a NZW doe yesterday. Unlimited hay & water, a bowl of pellets (.Timothy based is supposedly better), lots of vegetables & grazing (I never purposefully limited either). Vets are expensive, and I've found rabbits very delicate. Often when they're sick they're finished no matter how much $$ you throw into them or at what vet's. Be sure and ask your vet what their rabbit anesthesia survival rate is.
I have found males less aggressive. I don't think I ever had a male that bit/growled/lunged. That said, sweetest rabbit i ever owned/met was a doe and the meanest I've encountered was a buck. Males tend to spray urine unless neutered.