I have the Prizm on my 25, and it seems to work pretty well. It's probably not the best in the world, and you have to frak with the valve every once in a while, but it certainly works (for me, and my wife...we both have them on 2 separate tanks). I clean out the cup once a week. Nitrates are at 0 and it pulls out nasty stuff. Basically, it's good for what it is for what it costs.
I have HEARD that the Coralife works "better" than the Prizm, but I've also read threads where people rail against the Super Skimmer as much as the Prizm.
I've heard lots of good things about the Aqua C Remora Pro, but I think they're a bit pricier. All in all, I think if I had the money I would go for the Aqua C Remora Pro at the top of the list, then either the Prizm or Coralife if the Remoa is too rich for your blood.