You guys in the know think this would be a decent upgrade over the stock (non-screen) deck?

GPS Subaru Impreza RX XV WRX Forester DVD BT Navigation HD 2012 2013 SAT NAV | eBay

If so who would be the best person to install it, or could I manage it myself?

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"ALLPAWS" 2014 WRX RS 40 - modding very slowly.
2002 Mitsubishi Airtrek Turbo R - Ralliart Edition (daily)
2010 Nissan GT-R - when the Missus let's me drive it :)
Crotch Rockets . . .