Well,there are a few types of scent in general.Fresh,sweet & woody.
Fresh Scent perfumes are:
Carolina Herrera 212
Giorgio Armani Aqua di Gio
Hermes 24 Fauborg
Calvin Klein Eternity,etc.

Sweet Scent perfumes are:
Amor Amor Cacharel
One Dolce & Gabbana
Giorgio Armani Code Donna
Dior Addict 2,etc

Woody Scent perfumes are(the heavy one that only recommended to wear on special occasions or evening & NOT ON A HOT SUMMER DAY!

Trouble Boucheron
Allure Sensuelle Chanel
Dior Addict
Shaik
Opium YSL

Every spring or summer some cosmetic labels will release limited edition perfume for the season.Such as;YSL Opium Jardin,YSL Cinema Summer Edition (last year).So you might wanna check in some cosmetic counter.I'm sure your girlfriend will be excited when you give her the limited edition one,cos it only comes once in a year.And they will not re-issue the same perfume the next year.

So,happy hunting & good luck..;)