courthouse wedding? help!

marissa
My future hubby & I have a lot of long term goals. However a lot of those goals require money. I've always dreamt of having this intimate beautiful rustic beach wedding. Since neither of our family's are super big. My dream was to have my grandparents involved & most importantly have my grandfather who raised me walk me down the isle. Since he recently passed, I'm not as motivated to have all that anymore. So now we've talked about just going down to the court house with both of our closest friends. Which actually works out better since we are looking into buying our first house & expanding our family by 1. 
So how can I make my shotgun wedding perfect for the both of us? Being together is enough, but I still want to feel beautiful! (what girl doesn't) & most importantly what the heck do i wear without being overly extravagant or breaking the bank? I've looked everywhere for that perfect little white dress.