Unless you have some wild lift (which is foolish on these heads with small valves even ported) just run some LS6 springs. I run the orange units with my cam (it's a .551" lift, too much lift but the tight LSA and lower durations I wanted) and it's great! No point in wasting $100 if not needed.

Also, I have titanium retainers on my truck. They're only about 0.1g less than the stock units... so not sure if I'd recommend them either. I was expecting less weight but I assume the strength is higher. They're not steel as the retainers I have are non-ferrous (non-magnetic).