The number one bestselling cordless phone at amazon is the Panasonic KX-TG6512B and there is good reason that is the case. While it is not the most feature rich or advanced cordless phone on the market, this model is very reasonable and does have most of the features the average user would probably need.
The model linked to on this page comes with two handsets, which for most people is probably more than enough. But if you do need more or just the ability to be able to expand the system when you need it, then you can buy additional phone sets to add up to a total of 6. For small businesses and most families this will be more than adequate.
However, for many people using a speakerphone is not ideal as obviously anyone can listen into a conversation. If you do need privacy during a call then you have the option to buy a hands free headset, which will plug directly into the phones headset jack. This makes the Panasonic KX-TG6512B a really great device, as it stand out from many of its competing devices by having this headset jack.
Another outstanding feature if this cordless phone is that it has up to 13 hours of talk time on a fully charged battery. This means that even a very busy family or small business can spend most a day constantly on the phone without having to recharge the phone. A small business could have the phone in use for an entire business day and not run out of battery power; then, within 7 hours of charging the phone would be ready for another busy day of usage.
The only downside we could find with this model is that it does not have an answering machine built into the base set. Now this cannot really be expected at a price under $50, but it is worth pointing out that if you did ever decide that you need an answering machine then you would either need to opt for a different cordless phone system or you would need a separate device.
Overall the Panasonic KX-TG6512B is a fantastic phone system. All the basic features you could possibly want are built in and it is a very simple phone to use and set up. With the extremely high Amazon reviews you can pretty much rest assured that you will be satisfied as long as you are aware of the limitations of this very cheap model.