i ran my titan into a pole at work 2 months after getting my titan. ruined the driver-side plastic front bumper cover, and bent the bumper behind. it. $130 later, it's as good as new. i got the plastic bumper cover new from nissanpartsdistributor.com for $40, and got that painted good as new for $90.
the fender is steel with reinforcments behind it, but shouldn't cost that much. and if you get them painted together, shouldn't be too high priced.
do all the labor yourself (remove parts, bend bumper back, re-install), and you will save probably $700 at least.
as for the light: save your money. sand it down, then polish with a light abrasive. people clean up their 10-year old faded / fogged yellow plastic lights up like that. what can it hurt anyway, you were going to replace the whole thing in teh first place, might as well give a cheap fix a try.
if you need tips on removing parts, let me know. i've learned a few things working on mine. i'll post pics later also to ease your pain
