Hey Stuart you will know your clients better than anyone else but I used to use an iPad to show clients images at meeting at one time we used a projector as well.
A couple of years ago I went to a show run by one of the wedding album companies we use. I had a chat with the guy and he asked about how we meet clients, how meetings go etc. and I explained how we did it. He suggested not doing that and just only using sample albums and in particular large albums that we normally at that time wouldn't have offered and straight away going the analogue route made a huge difference to the amount of albums we sold and the size of the albums we sold.
However if you are looking for a cheapish tablet with a decent screen my daughter uses a Lenovo Yoga Tab that wasn't that expensive and the screen is very good.