Congrats on the purchase. I also love TTS. i like using the voice Dave. He sounds the most realistic.
The ipod is connected to your mount using a special cable. You can find this easliy on ebay and maybe other stores might carry them, like Staples. You use your TomTom to control you ipod music, etc.
If you have a back up from your classic look for the file: mapsettings.cfg and copy it to your 910's main directory.
The HI-FI bluetooth speaker I believe are stero units with a built in Bluetooth tech that your GO 910 might connect to. I don't think all bluetooth stereo units are compatible with the 910's bluetooth.
The RDS-TMC receiver is available but it won't work in the US. If you were to travel to Europe, it will work for you. However, there are many complaints about this accessory.