Hey Chris, Welcome! You mentioned private investigator and all I can thing about is the soon to be released Truth Serum. Check out this link:
For something fresh smelling and to possibly lift your spirits and of those around you I would say Ammunition and Instant Shine. Ammunition is a department store quality fragrance cologne with pheromones added which are really good at garnering friendly attention and mild attraction. Great for night outs with friends and casual day wear. Instant Shine is great too. The default is neroli scented which by itself smells great to me but the scent fades fast so you might add extra cologne with it. Actually if I think about it Ammunition+Instant Shine seems like a great feel good combo for making everyone feel good around you. Read up other user’s introductions too. You will see these two are definitely on the top of the recommendations list. They are easy to use and very powerful social effects modifiers.
Let us know if you have any other questions. You will be getting your gift certificate soon, so let us know what you decided to purchase.