Invest in CoS or OVP ?

[Coverdale]

I have 10k to spare, should I invest in a Circlet of Shadow or in an Ornate Velium Pendant?

Which is more likely to raise in price and when and why?

CoS game changing for Necro and SK at any level BUT OVP is very useful for almost every class that has to get past SG on a regular basis.

Discuss.