DENTAL ADVICE PLEASE?

I am 30 years old and my teeth are getting bad. I will be getting 3k in 2 months and plan to use on teeth. Problem is the majority of them can be fixed. One in the front has always been crooked and ill be damned if im getting braces at 30. People have told me that a dentist wont just take it out unless its unfix-able. Also, I have 25 members of my family and every single one of them has dentures so I know my teeth's' days are numbered. What should I do to get the best result?