Althou i have an 300W PSU, i also have an extra 250W ATX PSU (the old one) just in case. And because my Full tower can harbour both of them ... its not a problem. You could get a new psu (a cheap one) and divide de power between them . If you dont have a second psu harbour, you can always do this :
PSU in a box... er, a bay. Its and old 220W AT PSU that i use for testing (stuff) purposes.