the 297/98 combo. you can remove the 298 and use a 74aco8 and 4 FET,s have a look at
www.pchilton.co.uk/images/stepperdriver.jpg I have used IRF50N06 plus FR304 diodes
he used IRL640 as it is a 200 volt device with out diodes. i have read of people using two
298 in parallel but this is still not enough for what you want to do.
Hope this may help, Michael an eccentric English man.
P.S. or a 74HC08