I'm sorry you're having such bad luck.
I don't think you're being picky. It shouldn't have light bleeds like you're describing. I wouldn't worry about receiving a returned unit if you're within 30 days of receiving it.
I also wouldn't compare it to receiving 2 defective PW's either. I think the issues with the PW are something of an anomaly. I haven't really heard anything about this sort of defect on the Fire HD, most people seem very happy with them. You may have just had bad luck, unfortunately.
As far as using a Fire for a reader. I think it's just personal preference and how you like reading on it. If it bothers your eyes etc. Some people will only use e-ink for reading and then others are totally fine reading on the Fire and even prefer it. It's really just personal preference.
Good luck with your decision. I hope you're able to get a unit that you're happy with.
