tablets are awesome carpc's, you don't have to just plop it on the dash, you can take it apart & build it in even. I did this with my latest install & the one before that too.
the tablet I used was an st5021, it's a 10.4" screen too, but it's a fully reflective screen, reflective is sick in the sun & it's much better in the sun than even transflective.
it uses a 1.2 pentium m ultra low voltage processor, but it's pretty strong actually, flash skins & all are no problem, def enough for the car. with 512 ram & a 60 gig hardrive it ws under $700, including a legit copy of tablet edition & a digitizer built in.
what I did was disasemble it & build it into the dash, I was able to mount the motherboard part in the dash & the screen on a bezel I built... I also put a touchscreen over it & can now switch between digitizer & touchscreen... if you've ever used a digitizer you know it's awesome, especially with tablets built in on screen keyboard, theres a magnetic pen & the mouse follows the movement of the tip before you even touch the screen, making precise touches very easy, you can see the mouse tip before you even click, but when driving you want just a finger touch, no problem there either
it takes a lot of work to build a tablet inrto a dash, but no more work really that going with a rawscreen anyway, & the best part is everything is included with the tablet, my whole carpc cost around the same as a transflective lilli
this next picture is the reflective screen in direct blinding sunlight, notice how white even the black bezel is from the sun, if your going to go thru all the work, don't do it with a weak dim tablet, for just a few hundred more these tablets are a steal for what you get.
if you want to see more build details,
this is my install thread for this tablet.