whats a decent price 4 a good head unit. and to get a good system with amp and sub and everyhting what sort of price about

find some stuff that u like post it here an we will tell ya how much u should expect to pay

you can get decent headunits at different prices, obviously the more you pay the better quality unit you will get.
Dont forget to ask the shop, and dont think twice about looking in the sale section, some great bargains, with ex display models