Rogue - Weapon Upgrade Advice Please?

[Trazic]

I know it is tempting to buy a CSS now, because that is seriously a very solid off-hand weapon that will last you a very long time.

However I think it is strange to have an offhand weapon that is worth twice as much as your primary weapon as a rogue your level. I don't know if you have done much parsing but your main-hand weapon is responsible for at least 75% of your dps at that level. It isn't even solely because of backstab damage (which is huge) but since your dual wield skill isn't maxed you aren't getting nearly as much mileage from your secondary. Even when it is maxed you still won't swing it as often as primary.

I would prioritize upgrading your primary before buying CSS to be honest.