Ah... my first post! Just purchased my first Colorado on my new best time of the year... December 30'th. The dealer was ready to give some nice discounts! :)
I too have been spoiled by my first HUD in our 2004 Corvette. Since then, I even had one in our Mazda. Now that I have a truck, I am missing it. I am keeping and eye on the after-market for some time. Here are some ideas from crazy expensive... I am keeping my eye out for a projected onto the windshield without the need for any film and that is portable.
Carloudy, Wireless, Smart Head Up Display for Every Car
Most advanced GPS Navigation app - Sygic | Bringing life to maps
HUDWAY Glass ?*Head-Up Display made available for any car
More for industry than consumer, still cool tech: Continental Head-up Display Augmented Reality HUD
If you want to wear goggles: GogglePal