Stick to Your Budget
While you are visiting the store, the sales person will show you various pianos with wide range of prices usually higher than your budget. There will be a strong temptation toward more expensive pianos because they will have better qualities.
If you really want a better quality piano than your budget can afford at the moment, try to buy a piano from a dealer who will honor a full trade-in value. This way, if you can afford to purchase a more expensive piano a few years later, you can receive a full trade-in-value towards the first piano you bought.