I'd like to throw in Symon Jade's "Starship Orpheus" series as a decent read here. As a kid I read the first 2 books of the trilogy and was never able to read the 3rd until I found all 3 books in a used book store as an adult. It's very light reading, but definitely in the space opera genre and has 2 strong female characters, though the main character is a male. The series wasn't ground breaking by any stretch of the imagination and I know the titles are out of print now, I have no idea if any ebooks of them exist, but they may be worth a look.
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