Very tough choice ...
Razkal, i went through the same thing a while back, and like you already probably know ... "you get what you pay for".
As you know, I have a fiberglass kit, and I could already see that I might have to replace it by end of next year, this is just due to stone chips. I looked under my car, through my front bumper cover and I could see pin size holes where the stone chips are.
I'm gonna look into urethane kits for sure next time!
here are some lip spoiler choices that I was looking into:
first choice, by AutoVogue, $400, only available in Euro.