And by the way, using Delta 3200 at "box speed" is in fact a push though the suggested times take that into account. I and most others recommend using the next highest time, e.g. Shoot it at 3200 but develop it using the time for 6400 instead.
HP5+ and Delta 400, even FP4+ can be pushed well with DD-X or HC-110. I actually shoot FP4+ at 200 a fair bit and it comes out nicely.