Does a '91 Coupe need coil springs?

[Christopher Gharibo]

It seems over the winter the suspension of my 1991 Coupè quattro has gotten quite soft. I have the original struts and coil springs. 

I need to restore the ride quality for this daily driver. I just want to bring it to factory spec. I don't track and do not need a performance suspension, etc. 

What brand of struts do you recommend? Do I need to replace the coil springs while I am in there? 

Thanks!
Chris