In the two pix posted by XX3, the top picture is a pre-face lift X5 (years 2000-2003) and the second picture is the face-lift X5 (years 2004-2006) in which the front end was slightly changed (different bumper, grill, plus angel eyes).

The bottom vehicle has the aluminum running boards (approx $500-$600 new) which is a popular mod.
You can buy used BMW OEM xenon headlights with clear corners for approx $400-$500, $800-$1000 new.
Used clear corner rear tail lights will run $150-$200 used, $450 new. All prices are off the top of my head - YMMV.

Also check out the group buys pages - there is a current group buy on head and fog lamp bulbs - but it's suspended because apparently the factory was overwhelmed by the order.

The extent of your mods should be based on how long you plan to keep the truck and of course, your pocketbook. You can do a few mods or you can do alot. The sky is the limit.

I forgot to mention congrats on your wheel purchase. Of course, that obligates you to post new pix when you get them mounted!