I just picked up a March pump. I did a lot of research. It seemed like the best choice to me.
I looked at Chugger pumps as well, but I saw some questionable reviews, so I passed on them (at least for now).
There were some other options, but it didn't seem like they were really created for this application. It was difficult to get information on temp ratings, performance, and the materials used in the pump. it just wasn't freely available. I always felt like I'd be taking a chance with another purchase.
March seems to be the preferred choice for homebrewers. It's a little pricey, but I'm comfortable with my choice. We'll see how it works out down the road.