Tanya,
Since you are in school in Philly, once it warms up check out Dutch Springs. If you have not dived cold it takes some getting used to. There are also some really good days diving the Jersey Shore, but they can be hard to come by some seasons. if you have not found them yet check out North East Scuba Supply >http://www.northeastscubasupply.com/store/
They have one of everything in the shop at very reasonable prices with a never ending supply of specials and close-outs. They run a first class charter on their own boat out of Brielle NJ, there is a link to the boat from the home page. They have the hard-core wreck diving knowledge with out the attitude. Simply the best dive shop you will find locally.
Enjoy your dive vacation
John