well i have kept the standard HU because it looks awsome, the only
problem with using your standard HU is you lose the SUB control so you cant switch it on and off if you know what i mean, all you need is a phono converter just pop into halfords and ask them i cant remember what the part is called, ill have a dig through my recipts see if i can find it, it can be done though,
also the standard HU doesnt have a remote output so you have to wire it up to an ignition live, ill try get a pic to show you where mine is connected to because its quite hard to explain
hope this helps