X3 has HUD as well... But I've been looking into MobileEye and other technology to get lane departure and rear end collision detection and during that search I learned about ionroad app that does the same thing (not as well I'm guessing as it's $5 vs $750) but it does show your speed.
You could also look into the app WAZE that does do GPS speed (fairly decent accuracy) but also does traffic flow notices, police radar/lidar locations, accident and other nifty stuff too. I bought two cheap mounts (windsheild and dash I'm still comparing) phone mounts from flee-bay and use ionroad and WAZE every time I get into the car and I think it works quite well as a HUD replacement for the cost (Free or $5).
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