Can I mix Insteon & zwave switches with Vera Lite?

I have existing Insteon switches. Can I use them with Vera Lite?

Yes, but you need an Insteon PLM such as:

http://www.smarthome.com/2413S/PowerLinc-Modem-INSTEON-Serial-Interface-Dual-Band/p.aspx

also, look here for more info:

http://www.smarthome.com/2413S/PowerLinc-Modem-INSTEON-Serial-Interface-Dual-Band/p.aspx

Can you know powerlinc modem for Europe?