Hi Kosti,
How is live down under? All ok I hope?
First of all, thanks for the credit!
Second, if you want a decent FM/AM receiver for your carPC then HQCT is never overkill. It is constructed with normal car radio tuners components thus making it a normal HU with an abnormal interface (USB). And further more it has AM support and the Silabs thing does not support AM. The Silabs 4701 chip only supports FM/RDS and nothing more. And because you want/need AM the Silabs dongle is not an option I think. Of course HQCT is more expensive and needs apart from the USB connection power and an analog audio connection but if these arguments are not an issue then I believe that HQCT is the perfect solution for you.
Best regards,
Putput