People seem to be voting for the purse because it's more practical. I'm going to vote perfume because it's LESS practical. This is a treat for yourself so splurge on something that's just pure indulgence!
I would definitely go for the bag! In my opinion $10 fragrances CAN match $200 fragrances depending on the person but a $30 bag cannot always match a wonderful quality of a designer bag Substitute your perfume for now and get the bag
Purse! I like the idea the other poster had about going to the perfume counter often. While your at the perfume counter and ask for a sample most department stores have tons of samples if one store doesn't have it try another. I know I got a few when I bought Bbags from the boutiques, so I know they make samples of it. I'll peek around and see if I can find them if so I'll pm you, since I'm doing major cleaning this weekend. I don't know why I've never been a big perfume person probably because of my allergies most perfumes seem to irritate my nose/eyes.
also, during the holiday season (which is only a few short months away!) they have great deals on perfume sets so for the same price of the perfume, you might get some more goodies like a shower gel and/or lotion thrown in.
OP please do let us know what you ended up going with!