Thank you all for your opinions and tips

. I decided to go with the majority and got a Hauppauge PVR-150 MCE Kit. The remote looks really cool and the learn feature for the TV button is a welcome extra to switch off my LCD TV. Tomorrow I'll receive my new HTPC and then there will be a new Media Portal user. I'm sure I'll be back in the forum with other questions and it will take time until I'll be able to help others.
Since I studied the whole FM tuner issue, here is the explanation:
Thanks again