2008 4x4. Leaf spring replacement or airbags?

The factory 3 leafspring set is getting a little tired. I would very much like to change it out and install a set from Allpro, and really leaning towards the expeditionary set.
However, my checking account currently disagrees with this as being a practical solution. I have also considered the possibility of installing an air bag kit for now, which is about half the price of the springs.
My concern which may not be justified is this. Would I be increasing the probably of the factory spring set suffering a blowout by doing this?
What are your thoughts?