ignition coil questions

so what would be a good coil to go with for performance? is the borg warner coil i have good enough? or should i step up to the taylor or mallory coil? if i step up to a taylor or mallory or a msd blaster or an accell coil do i need to upgrade my ballast resistor? i have been told the the lower the ohm on the ballast the better? is this correct? and who makes some good ballast resistors? are the echlin ballast resistors good?
I guess i could go to all the different part stores and do an ohm test on there ballast resistors untill i find the one with the lowest ohms.