Got a GPS/ Audio unit that resembles a RNS 510 from ebay...Just wanted to know from those who have had it installed.....where to get it done perfectly(steering wheel controls functioning as well as on the MSD), what price range do i expect....and whether it will work well or better than the stock basic Golf GTi MKV Audio system in terms of sound quality...

http://cgi.ebay.com.au/7-DVD-GPS-PLA...t_16903wt_1165