Well...first of all you must consider if you want an acoustic piano or a digital one. If you go with the digital version (which are a lot easier to maintain and a lot less expensive) you could read an article like this one and take advantage of all the tips that you need to take into consideration before making a purchase.
Hope this helps
As far as I know, there's acoustic, digital, stage, upright pianos. There are more, but there are the most common ones. I have written some articles on these and compared them. Click here to see my articles. I hope they help you.