First and foremost in purchasing a piano is this...
Buy only the absolute best quality piano that your budget permits!
What I mean by this if you'd love a grand piano but only have the budget for a low quality brand of inferior quality you will be far better off buying a full-sized upright or studio upright from a quality piano manufacturer. Remember this is an investment you will have for a long time. Also your chances of trading up to buy a better piano if you decide at some time in the future will be far greater because your original piano will hold its resale value much more than a piano of inferior quality, not to mention the sheer joy you will derive from playing it (Priceless)!
If an upright piano doesn't fit your budget consider the smaller console but never, ever, ever even think of a spinet piano! An absolute disaster of a creation of a piano and I use the term piano in the loosest way. You save maybe three to four inches in height for a lower profile but you sacrifice a direct blow action of the console, a much more responsive touch versus the indirect blow action in the spinet, a very sloppy unresponsive touch at best. Not to mention expensive down the road repairs when the elbows in the action start to start to wear and break. I cannot emphasize enough...step away from the spinet...run don't walk. It's also a very hard piano to sell when you want to move up to something better.
The rest of the considerations are really a matter of taste for style, color and finish which should not effect the price too much, unless you go Liberace.
In my next blog post I will go into the pros and cons of digital keyboards. That's it for now from I Want My Piano Lessons from Great Neck, NY. In the meantime...keep making music!