SCE is pretty much exactly for a network of that size.
SCE will manage your windows updates for all your computers, report on their vital statistics (free drive space, etc), and if any of those two servers are Hyper-V servers it will manage all your virtual machines for you. It does a bunch of other things that I didn't bother using as well, like reporting on installed software, etc.
Once you graduate from SCE, you're then into the big-boys toys, with:
- System Center Operations Manager
- System Center Virtual Machine Manager
and so on and so forth.
So, no, SCE is not overkill for your network. It's pretty much the right size. But if all you're after is updates, then you just need WSUS and an appropriately configured group policy.