Common suggestion is to do the live rock and sand with a Protein Skimmer and sump. I personally have a cannister with a built in UV filter; however, the more I think about it, and the more sumps I see I wish I would have gone with a sump set-up, it would have made certain things a lot easier, but I could also see it being a lot more money & time to set-up.
Essentially, if you want to do more maintenance, get the cannister, if you want felixibility and stability, get the sump