Customization of Social Networking/match making application

I am buying an out the box solution such as Dolphin from Boonex that I will have professionally installed on my dedicated server. I need someone to customize registration forms and searchable views for me. The forms are pretty complicated and include several fields with drop down boxes with multiple selections. It is not a dating site but a travel site that requires matching capability. When destination is selected for USA, user should be prompted to select a state but when Australia is selected, user should be prompted to select a teritory from the drop down box, and be allowed to select multiple destinations, i.e. USA - Florida or California, Canada - Quebec only, etc. If you have experience with customization of other out of the box solution that has social networking and matchmaking capability I am open to your suggestions. However, since I am not a programmer, it has to have an owner friendly back end that I can manage by myself. It should also come with language packs for further development down the road. You need to be able to show me your prior work examples.