Bridal Shower Ettiquette

I am wondering about the ettiquette of bridal showers. We are getting married in my home town which is 4 hours away from where we live, but all my family is there and my bridal shower will also be there. 75% of our wedding guests will have to get on a plane to attend our wedding which will be very expensive for them. My idea for the shower is to only invite immediate family of mine and my fiancee and very close friends of mine who may actually travel to attend. I don`t feel that it is correct to send invitations to every female on the wedding guest list especially if I know they will be unable to attend. I also don`t want any hurt feelings when my fiancee`s great-aunt from California does not receive an invitation, and I also don`t want to look like a gift grabbing bride. What is the ettiquette of Bridal shower invites?