screens come in different sizes like TV liddat. $900 is a freaking small screen. there are some models that have screens aiya..
visit
http://www.vdodayton.com/default2_and_fz_menu=navigation.aspxthat's siemens vdo's website for its products. u can get the specs there. (page loading a bit slow on this website)
for large screens, look under the section "monitor navigation". =) for $900 u would probably be referring to the "portable navigation". go look n see.
there's also another korean made (i think) gps called tibo. their standard product retails for $1,100 with a screen size of about 2.1" by 2.8". for the hardware specs of the tibo gps, refer to
http://www.tibogps.co.uk/index.htmlany other qns..?