Hey,
I have been down that path, but with a 180sx, and all I can warn you about is that you really do get what you pay for. I purchased one of those $600 bodykit deals from a supplier on ns.com and it cost me an absolute fortune for the panel beater to fit up and meet all the lines perfect.
If you look arond you will see many cars that have massive gaps between bodykit and panels. It just isn't worth it really.
If you have to pay more for a front bar from a known brand (not supplier) than it is definately worth it!
Cheers
Josh