Where in Philly are you looking? City or burbs? Iron sport gym (google it) is arguably the best gym in the state - amazing place. However it can be a hike if you live in the wrong part of town. I am really short on time so I can't make the drive there, but the second my schedule frees up I'll hit that place like there is no tomorrow.
If you want something in the city - Fit Gym (fitinphilly.com) is the best bet - 44th and chestnut streets. Its a 5 min walk from my house so thats where I lift. Chalk, tons of plates (tons of 100 lbs plates too), racks, boards, chains, dbells up to 200lbs, all HS equipment as well... you name it, they have it. Prices are good too. Honestly, if it wasn't for Iron Sport, I'd say its the best gym in town.
Hope this helps. Stay away from local YMCA's (garbage) and chains (LA fitness shit). I know there is a CrossFit gym downtown (7th & Spruce area) but who the fuck wants to lift there?
If you have any other questions feel free to send me a pm.