Sammy - you could get away with AIO or pockets that are previously stuffed (ie stuff them and then put them on the changetable ready to go) both of these are as quick and easy as a disposable to put on.

Velcro or hook and loop nappies are the fastest and easiest to use but I found my DD very quickly got the hang of getting these off so around 9-10 mths I had to convert my whole stash to snaps - too pretty to cover up with pants :-)

Heavy wetter - you might find the more absorbant fabrics in MCN will mean your nappies last longer periods of time. My DD can soak a flat in half and hour but our MCN last 4hrs.

We started off with 5 MCN to try out the different ones and see what worked the best. Try a mixed package from one of the online stores