First of all, welcome to the forum! Secondly, try to avoid non-name-brand stuff on ebay...usually you get what you pay for...half price = half quality. Thirdly, do what you want to your car. Whatever you think looks good and makes YOU happy, go for it. People on here will share their opinions, sometimes whether you ask for them or not, but as long as you like what you've done to your car it doesn't matter what they say.
Since you asked for opinions though

I'll be happy to give mine. Nay on the projector headlights, yay for the clear bumper signals. I've thought about putting clear bumper turn signals in as well, and we have the same year and color mustang! Also, IMO, you should save up money for a intake and tune package from a reputable tuner.