BleepingComputer.com: Upgrades...

I would like to purchase a DVD RW and also a WD 250 GB Hard Drive for my Inpsiron 1501. I have a DVD R and a 80 GB Hard drive now. My question is if I would buy them, will anything change if I was to do a clean install of Vista HP 32 bit? I have installed Vista 3 times now with no problems. All my drivers are there. Also, I have the re-installation DVD for Vista, so if I did buy the 250 GB HD, will the re-installation DVD work?

Thanks