car computer

so i finished my watercooling project i was on here a while ago talking about and this month i get my licence so i was thinking, since im getting a new computer, what am i going to do with my old one? well i thought about it and i was thinking putting a touch screen in my car and then putting my computer out there in a custom case under my seat, so i did a little research and i found that i can buy a power supply for it that hooks up to my car im pretty sure with the same connection that hooks up the radio i also found a 7 inch touch screen for 40 dollors that has a usb port and drivers heres the links

power supply -http://www.mini-box.com/M2-ATX-160w-Intelligent-Automotive-DC-DC-Power-Supply?sc=8&category=101

touch screen- http://www.dealextreme.com/details.dx/sku.16124~r.83188615

all together thats about 130 dollors

so what i was wondering is is there a way i can use the power supply i have now in my computer and just buy a converter, because 90 dollors for 160 is alot of money, has anyone else ever done this? i know other people have i mean on these forums

im almost done with my new build to all i need is the motherbored and proccesser i have everything else its already been shipped soo like 140 more dollors and my new build is done

i have another question could i get a wirless card in one of my pci slots and be able to use wifi like a laptop?
 
heres a update on that car computer i was talking about
it probably wont happen untill the spring because thats when i go back to work sooo yeah lolz
i picked out all the parts you guys should help me and tell me if they would work together ill also put together a diagram of whats going onnnnn

so here is the lcd screen i picked out cheapest i could find bassically
99$ http://www.dealextreme.com/details.dx/sku.14784

here is the touch part of that
37.50 http://www.dealextreme.com/details.dx/sku.16124~r.83188615

here is the tuner card for radio
19.99 http://www.newegg.com/Product/Product.aspx?Item=N82E16815260017

here is the graphics card with the composite out for the tv i wish i could find a cheaper one 39$ http://www.newegg.com/Product/Product.aspx?Item=N82E16814139174

is there anything im missing? i dont understand why if you want a 7 inch vga out monitor the cheapest one is like 300 dollors oh well

heres that diagram i love the pencil in paint i have photoshop but i dont think its as usfull as paint for small projects

919tv5.jpg
 
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