i've found there's very little difference between male personality and female. i have females that are slow and cuddly and i have a male that is full of spit and vinegar. then again i have a female that will not sit still if life depended on it in out time. really its the individual rat's personality. as a general rule males are supposed to be more laid back but i've found too that females become very laid back when they get old. the males seem to just get lazy sooner.
if i could have either males or females then i would stick my hand in with the prospective new ones and see which one i liked he best. unfortunately i'm allergic to the male hormones once they mature (though neutering completely fixes this) so i tend to go look for females. but i still pick out the ones i want to take home by their personality. i tend to be a sucker for the overly affectionate ones. i have a couple girls that will lick you silly if you let them. violet will try to lick your fingers to the bone when you hold her.
anyway, you're not being too picky. i like having all the energy around that a girl brings then the cuddle time when they're tired and get old. but i like my boy i have too. he's very playful and quite the homebody. he loves to be with his people. if you only want one gender and want the females then hold out for them and find the ones that suit you best. if you can afford to have a gender altered or two different cages then get both. if you aren't really decided on either gender then these boys are available, you might as well start with them.
in either case let us know what happens and post pictures once you bring your babies home.