Do you think this would help?

Yesterday, the Apple store put in a new hard drive (because I'm a klutz). They installed 10.5 for me, which was nice. The only problem was that I didn't have iWork '08 on my new hard drive, so I used my 10.4 install disk to install the bundled software. The reason I'm posting is that things just don't seem nearly as crisp as they did 2 days ago on my old HD running 10.5. It's the same HD on paper (160GB 5.4K). Do you think it could help things run better if I were to reinstall Leopard with the Archive and Install? The biggest problem is AirPort. It's really being erratic.