Have you got a compressor? I’m guessing not, but if so go for an air powered die grinder. If you go for one of the small air turbine tools, it will get in everywhere you can with your Dremel, but you won’t believe the power. These are durable tools for the most part, so I wouldn’t hesitate to buy used.
If you don’t have a compressor, and use the Dremel a lot, I’d maybe think about getting one.
An electric die grinder is another option. Not as durable as the air version, and more bulky, but these tools have cone on a lot in recent years. Probably a lot less costly than a Foredom.
The Foredom seems to suit certain trades, such as the jewellery trade, and the quality is certainly good, but for general use I’d probably go for either type of die grinder in preference. Both types shown below.