Awesome! - Thank you so much for the extremely helpful replies!!
It looks like my PSU - according to all the calculations I have done - should actually work (at least in theory) with the 350 PSU - but it's good to know I have reasonable options if it doesn't!
This is hopefully just a stop gap until I can put a I7 machine together - tho in this economy it's hard to make my "hobby" a priority.
At least now I should be able to get my Total War on! (well - maybe not the new one)
Thanks again - you all are the best!