Just realized that if you end the corner combo I listed on the previous page with a cr.C, then you have a 400 damage, 0 Meter, 1 Drive combo for Billy (that ends in a reset situation).
Corner
jD, 2B, 2B, 2B, 623B, 41236C, 236C, (DC) 214C, 623B, 2C
0 Meter, 1 Drive, 394 damage, 51 stun, almost builds a full meter.
Also, if you're feeling especially confident (or you really need to pull a win) and you have 3 meters (plus 100% HD), then you can combo his NeoMax from a mid-screen 623B or 6B for an easy 1/2 life combo.