try to save money. Both wil be good the in dash will get less sunlight and it will be easy to see in the day. If you have a car that can get stolen go with in dash. less chance of you losing it and your car.
This is how I calculate it I want the lilliput 250, I want it in-dash 100, no I can't do the conversion, 100. Seems good to me, it is pricey but its still under warranty so from what I can tell its the cheapest in-dash lilliput still under warranty because no one else sells one
VIA Nehemiah M10000, 256MB RAM, 40GB HDD
100W DC PS /w ITPS, TV tuner, Slim Slot-Load DVD
GPS, Streets and Trips 2004, Rearview Camera
Bluetooth, 802.11b & CDMA 1X
In-dash 7in Lilliput Touchscreen