If you can afford an after market heatsink/fan, then go for it, if no then it should be fine, the only problem is that you might need thermal grease ( in case you've already spent it before)
i'm just gonna use the same hsf to save money. I'll invest into some AS5. the only thing i'm worried about is taking the hsf OFF the 3000+. Never actualy done it before. hope i won't break anything.