With the weddings in my family we only invite family members (including extended family) and close friends, we don't invite all the other wedding guests. We also usually make it a small affair at have it at someone's house. On the other hand, I've been to some showers that are like mini weddings and where all the females that have been invited to the wedding are present. I guess it really depends on what you want. Do you want only those that are close to you present or do you want everyone there?
Good luck with your decision!