Depends on the size of your tank I guess. I don't think wet/drys are practical on a small tank, but on a large one it works well.
I have a canister filter on my 37 gallon, but I will be removing the carbon soon and just using it as a big pump. ( I may put some LR
in there for filtration.)
If You are going to use Live Rock, how about just using a sump instead? A sump is pretty much the same thing as a wet/dry filter, except there is no bio-media to collect nitrates. Most people here recommend saving your money and not buying a 300 dollar wet/dry filter. spend 10 bucks and get a big rubbermaid container. works just the same.
Just makes sure your tank has built in overflows because I don't trust the hang-on-back kind. (another reason why I don't have a sump.)
Do you have the tank yet? what size?
by the way, WELCOME TO AQUARIUM ADVICE!!!
Hardware: 37 gallon SW
tank and stand by Oceanic Systems, Magnum 350 Pro Canister Filter (half carbon), CPR Bak Pak 2R skimmer, Maxijet 1200 Powerhead, RenaCal 150 W heater, Compact fluorescent lights with moonlights. 40 lbs of liverock, 3" sand bed.
Software:2 Tank-Raised Ocellaris Clowns, 1 Purple Firefish, 1 Electric Orange hermit crab, 18 Blue Legged hermit crabs, 8 or so Nassarius snails, Xenia, Blue, green, and Green Striped Mushrooms.
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Central Illinois Marane Aquarist (CIMA) member.