Taking advice on a waiver-wire pickup is pretty low-risk.
Drop the worst player on your team for him; if it works, great. If not, give it another shot next week.
However, taking advice on who to trade for is much more risky. Ideally, you want to trade for players before their value goes through the roof.
Here are five players who you will have to give up something good to get, but who I think are good trade targets. Hopefully you can buy low on one or more of them in your league.