it takes me weeks and many hours of shopping around to choose my seeds every time i buy. maybe i am a freak. i go with femenized as well, and all of them have been female so far with no problems. there are huge price differences, so maybe since this is your fist shot go with something kinda cheap or mid range until you get your shit down. but its your money, so really whatever you want.
my best performing plant i have grown is from paradise seeds, it is called white berry. its a blueberryxhashplant. it finishes fast, like around 8 weeks and yeilds are good. it is a pretty popular strain right now so you can search it with good results on this site. i think it cost around 70 bucks off of attitudes seedbank site.
good luck in your hunt