I want to buy a USB powered GPS module together with a mapping software. Any recommendations and various options that I have ?

Much like Garmin's MapSource software and GPS 18 USB:

> 
> nRoute features an easy-to-use
>  interface, making it intuitive to
>  operate so you can focus on driving.
>  It offers auto-routing and
>  voice-prompting capabilities to
>  virtually any address. The GPS 18 USB
>  includes a 12 parallel channel,
>  WAAS-enabled sensor with USB
>  connection.
> 
> 
>