Power sub plate amp replacement. i have an older JBL PSW1200 powered sub. you probably already

Question

i have an older JBL PSW1200 powered sub. you probably already know about the amp of this unit having issues. i actually had this sub for over 8 years now before the amp went out on me, but i like the sound of the sub. i can't find a GOOD answer to my question of what size amp to replace it with? i see people say the amp unit is 150W, another 200W, another 300W ??? i've been looking on a couple websites: http://www.mcmelectronics.com/browse/Amplifier%20Modules/3831187 http://www.partsexpress.com/webpage.cfm?Webpage_ID=3&CAT_ID=43&ObjectGroup_ID=505 i would love to be able to find an exact match, but i know that's probably not possible......could you please let me know what is a 'good' amp to replace the defective one with? thank you soooo much!!! amp dimentions: L x W x D = 12" x 8" x 3.25" rick [e-mail]