With a DD at 16 months, I finally nagged convinced my DH to buy a dishwasher as the dish washing is just getting too much. 
He would like to get a slimline dishwasher as it would fit nicely next to our washing basin. Apparently it makes sense to have the dishwasher next to the basin.
For me, I just want to go for the full size dishwasher as it can take more dishes and I am quite happy to fit the dishwasher on the other side of the kitchen due the the lack of space next the the kitchen basin.
I was told water piping would be difficult if it is on the other side of the kitchen as it involved lifting the tiled floor or the water pipe has to go underneath the floorboard to reach the other side...... I thought this type of problems would be the 'engineer' problem.
A quick summary, it's just DH, myself and DD, but both of us works. Currently I am working 3 days a week but it would be nice not to nag ask DH to do the dishes (too much grumpyness involved!). 
All suggestions are welcome as this debate has been going on for 3 months and Christmas is round the corner!