THE BRIEF: Want a system that get me from point A to B, also want the system to reroute me if it sees jams ahead. Dont have a need to play DVD's or watch TV. Also want a better stereo system with out going mad. Want as much bass as possible, without having a Sub box in the boot. Happy to have a small amp though.

If I went with a Sat Nav system with a screen, isnt it like shouting at a thief to nick me ? What is the security like ?
Would I be better off with a system that was single din and used the front of the display to show simple arrows ? Some of the systems on the net Ive looked confuse me as to if they are a pure nav system, or also do the normal stereo stuff.

Which systems would people recomend ?

Speaker wise, I hate treble. Want to spend about £120 on from speakers ? Recomendations please

What do I do with the rears ? Also amp recomendation. Dont want to spend more than £250.

Thanks in anticipation of any help

Jonathan