No more waiting is necessary, as the new Raspberry 5 is now in stock.
This Pi now even faster than before is also able to support PCI-express Hats. Available additions to this are housing with active cooling and it can handle more power than before with a special higher amp usb power supply.
If you don't necessarily need the extra raw performance, then the Pi 4 is certainly still an excellent choice, especially because the price difference with the Pi 4 means you get more memory for the same price.
If you have any questions, we are always happy to help you at the counter, or via our online helpdesk!