yo there,
sony aint bad at all, i dunno bout the one your on about, neva heard it b4, but a friend of mine, hes got a lada riva 1.5 (poor guy...!, hahah, still, cost him ?50, hes stuck a webber carb thing in and goes prettie damn well), but hes gone and stuck 2 1200watt 12" sony octo subs init, powered by 2 200watt pioneer amps (which do a damn good job, even if they are under powered) made himself a box and stuk em on his rear passenger seats, it sounds so nice, and its so loud and bassie u can hear it from about a mile a way!, but there impressively bassie, even if they did cost ?50 each from halfords, if ur interested u can get them boxed for ?70 each off of this site...
http://www.mcs-direct.co.uk/acatalog/MCS_DIRECT_Subwoofers_66.html neway goodluck, and i hope u end up with what u want...