Well, you absolutely don't need a wet/dry filter and if you buy one you'll probably want to throw out the bioballs and replace it with lr
rubble. You could use it as a sump, but you can build your own sump pretty easily and save a ton of cash. If you're going the lr
route, get 1-2lbs rock per gallon and that'll take care of your bio filtration - you shouldn't really need your bio wheel with the lr
either. If you plan on having that much live rock and going for a reef set-up in the future - save your money on the wet/dry and canister filter and grab yourself a protein skimmer.
The addition of a sump would be great if you can do it - so you can throw all your equipment in there. Although you really don't NEED a sump either. I'll be running sumpless due to space constraints.
As far as morphviper's advice - some consider the damsel cycling method a little out-dated (although some still do it), you can cycle your tank with live rock and/or a couple raw shrimp and get the same results. You won't have to deal with the hassle of damsels - and you won't have to kill a couple live fish to get your tank ready.