Well, where do I start, mines was a base spec as well. As Graeme says, hope you have deep pockets there's loads you can do.
I've added -
Nappa Leather Steering Wheel
Cruise Control/Audio Controls on st/wheel
Front zenons/ rear D4 lights, internal LEDS
Front Fogs with built in LED rings to act as DRL's
Headlamp Washers
Roof Rails
EGR's Blanked
Modified D4 Front Grille
Puddle Lights
Sump Plate (for off roading just in case)
CB Radio
I'm also in he middle of fitting a split charge system just now with a 2nd battery for camping etc
There is also remaps you can get to add an additional 50 or so BHP! Even more power to be had!