One of the main sources for piano evaluations is “The Piano Book” by Larry Fine. It’s in its 3rd edition, and you’ll find that piano dealers know it. If you’re interested in the details of how to evaluate a piano, and what reasonable prices are, this is your book.
Your Pacific Northwest Ballet might be a reasonable deal. But a $1600 Yamaha electric piano is also going to be a reasonable deal. (And it’s a safer bet.)
A piano teacher will be familiar with the dilemma facing students who need to practice, but don’t have much money. Since you’ll be paying them to improve (and since they want you to have a good experience) it’s definitely in their interest to steer you in the right direction.
The reasons I was being cautionary are two-fold. Giving pianos a fair evaluation is tough. If those $1600 Pacific Northwest Ballet pianos immediately need tuning, action regulating, and voicing, then the real price might be something like $2000, not $1600. $2000 buys a very nice electronic keyboard.
Lastly, and this is more annecdotal, I’ve noticed that pianists who learn on poor instruments (or ones poorly maintained) seem to have a tin ear when it comes to being subtle. You asked about not forming bad habits? Playing on a piano with poor action, which doesn’t stay in tune, and which never was a good instrument in the first place will develop bad habits.
There are church pianists who can play pieces much more complicated than I am able to without making mistakes, but everything they play sounds something like an elevator speaker. This drives me crazy, and they can’t tell the difference!
A Kurzweil (which is in your price rance, second hand) includes recording of a Bosendorfer, which is a SENSATIONAL piano, in some people’s opinion better than a Steinway.
And I believe Yamaha electric piano owners are generally very happy with their purchases, too. So it’s kind of a sure bet.