When your working on your suspension and installing a new set of springs, coilovers, or simply a new top strut mount, its always a good idea to replace your front strut bearings as well. Frankly your down there working on them anyway, and now is the perfect time for a replacement.
The front strut bearings take a lot of abuse and load over the lifetime of your vehicle and can become noisy over time, replacing them for a fresh set can improve the ride quality and comfort of your vehicle and is a no-brainer for anyone already replacing other suspension components.