Need advice please regarding Display screen.

Hi guys.
hope all is well. I have been playing around with the arduino uno WiFi shield and LCD displays and I think I have gotten the hang of it. What I want to do next is send a high resolution image from my web server to a normal LCD screen (like the ones you buy at best buy and stuff).also, i want to attach more sensors to it as well. can i do this using an arduino uno or do i need something with more juice and inputs?

I read tvout library is able to do something similar.
http://playground.arduino.cc/Main/TVout

will a pcduino make things easier 'cause it has an hdmi port that i can use to hookup the lcd screen?
any suggestions as to what can be done to achieve this?

to recap...Basically i want to send a high quality image from a webserver to a normal LCD screen, which will be connected to a wifi (arduino).

any thoughts and suggestions are welcome. thank u in advance
cheers

OK, I'll bite! Put you out of your misery.

You said "a high resolution image". You have automatically excluded Arduinox. If the display has an HDMI input, PCDuino (or Pi) is clearly the way to go.