Im going to buy a power amp to add to my yamaha dsp ax630 se for that extra performance with music. Ive been offered a Yamaha mx-630 power amp for £100. Problem is i cant find any information on it anywhere. Do any of you people know if its a good amp and if it is better for driving my mains then the dsp amp im using for home cinema. Does it compare to power amps priced at about the £400 mark which is my budget. Any help would be greatly appriciated.