If you are concerned about performance, you may wish to consider a NEW DRIVE.
While SSD's are great, you can get a 500GB hard drive for $60 that would be far better than any 80GB HDD.
Also, if you have an 80GB HDD it's age makes it more likely to fail. I replaced several 80GB HDD's in laptops with 500GB HDD's.
*Newer drives tend to use the "ADVANCED FORMAT" feature which can cause issues with cloning (or backup/restore) from a non-advaned drive to a newer advanced drive.
I "successfully" cloned from an 80GB HDD to a 500GB HDD but got a couple weird errors. I ended up having to do a complete reinstallation of Windows.