Pep boys now sells a 1F ultra cap ( the kind for car audio)..with a 0.0015 ohms ESR..
if it was cheaper i would have got one..but at $99 american i just couldnt see it..
at .5CV^2 thats 72 Jouls energy.at 12V hmmm
my 110F cap holds 343Jouls...but the ESR is 0.003 ohms
edit: i found a good source for magnets , these arrived today..
**broken link removed**
they are AMAZINGLY STRONG , at least twice as strong as the 1/2 "
ones i have..and for 1.50 each you cant go wrong..