Headlights a really common issue on the 04-08 grand prix's, mileage doesn't seem to matter anymore unless it was sealed in a garage somewhere forever.
The HUD is likely a broken spring for the screen, it's the most common failure on the HUD for 04+ cars. Whoever does the digging into it must be careful about the plastic trims around it, it's very bittle and can crack/snap on you.
If you do buy it I'd highly suggest you do a shift kit with new fluid and disable the displacement on demand as soon as possible to prolong the engine life. The early versions in the LS4 are prone to oil comsumption and possible lifter problems.
