Couldn't disagree with you more^^^
Name brands are the exact same things, you just pay for their name on it. A rear spacer is just a piece of aluminum that is milled down. Buy a name brand kit like superlift or truxx and you will be disappointed when you find out you spent $200-300 and have the same or even less lift than a guy that bought ford keys and spacers for $100-150.
I am not saying ALL name brands in life are same quality as ebay things, but in for this particular scenario, yes ebay keys are forged just as all name brands and the spacers are the same. I would agree with you about spindles but not keys. But, I have read before that there is an ebay brand that claims they make the spindles for McGaughy, however, I choose rough country for spindles on our trucks.
I would say with keys and 1.50" spacers (if you have auto ride you wil have to lengthen the sensors). If you have autoride and you want to scrap it and run bilsteins, you will need to get LS style springs or z71 springs. These can be bought for $60 or less on ebay and rockauto.
As for tire size, Id suggest 285/70/17 if you run stock or something similar for your wheel size. You can fit bigger, but that is not always better. Then you run into issues when flexing etc. Each person has their own taste on what fits, google pics and you will find a ton of options out there.