The fact is that very trade has certain sales tactics to trick the gullible customer. One of the most common tricks is to rush you with so-called time limits and threatening to take away a 'once in a lifetime' opportunity. The irony is that you cannot be faulted on it because most of us tend to get caught in glib sales taught and make wrong purchases. One of the best ways to avoid this is to read digital piano reviews and get to know the brands of best digital pianos.
Admittedly, a musical instrument is an investment. It is natural that you want best value for money but you need to keep in mind that you do not always need to look for the best digital pianos simply because that is not what you really need if you are a beginner.
In fact, if you are a new student, it is a good policy to keep away from high-tech models. Buying an expensive and latest top-of-the-line model is not the right thing to do at this stage. It may look impressive but can also be a big distraction; it may be too confusing and intimidating to let you concentrate on learning music. Moreover, by the time you reach a level where you can appreciate sophisticated models such as the Disklavier range of Yamaha digital pianos, it may be obsolete by then.
You can get some very good digital pianos at affordable prices. Most of them come with loads of options including sound libraries. Practice on these inexpensive digital instruments and when you are ready, go for one of the best digital pianos that you can afford to buy.
Standard digital pianos have 88 keys but that is not what you need right now. As a beginner you can do with keyboard size of 61 or 76 keys. It will save you money and you will not even notice the missing notes. However, avoid digital pianos with 49 keys because you will be able to notice the missing notes in the first year itself. However, if that is the only option you have, you can try your hand on it for sometime before you think you are ready for the next best.
Most models, including Casio digital piano models, come with built in speakers but it is a good idea to check before you actually buy one.
You also need to check digital piano reviews for weighted action and touch sensitivity. This relates to mimicking a normal piano; the ability to produce a louder note by pressing the key harder. Also check for the polyphony feature, which allows you to produce multiple notes at the same time. 10-note polyphony allows you to play a chord with all ten fingers and also not lose a note.
Best digital pianos are the ones that you actually need and serve the intended purpose. Depending upon whether you are a beginner or have already earned your spurs you may choose to buy a basic Casio digital piano or a Kawai digital piano or one of the top-end Yamaha digital pianos.