This man has the right idea, in my 106, i have got a 10" sony sub, with a shark 1000 watt amp (£80 for the two, and i made the box myself to the size sony recomend) I have 120W blaupunkt speakers in the rear (about 30W RMS) and 80W JVC speakers in the front (about 25 RMS), running from a pannasonic head unit. I did this setup on a budget, and no, its not the loudest "bad ass" system in the land, but i, along with many of my mates think my set up sounds nicer than my mates £200 subs which were already in a twin sub box when bought, with a 2000W amp, and 6x9's on the parcel shelf, and standard ford door speakers, both of which are running off the head unit. If you want to listen to music, you dont need loads of power or money, but look for things that will work well together, rather than big power ratings. I dont no if this will have helped. but thats just my 2p Alex.