Wanted to buy standard series 3 single din cd radio head unit

G'day all. I would like to buy a standard nissan single din cd radio head unit to suit my series 3 Gu ute - mine has died. I know that aftermarket units offer more features and are pretty cheap however I am a bit of a purist and like to maintain the factory look - I prefer function over fashion so don't need all the extra "bling" that comes on aftermarket units. If anyone can help that would be great - obviously i would need the security code for the unit as well . Thanks Old Wal.