I think going with a std 29 gal as Seth mentioned is a good idea...you'll save lots of money on the tank and stand, and be able to put it towards other equipment.
We own six "plug-n-play" setups, and they work great for our purposes, which is QT and/or growout tanks. We have a HQI model, but I yanked the HQI and added LED's. We also have a LED model, as well as PC models. IME, the LED models are PLENTY bright, but it depends on what you're keeping. For our purposes, I actually put some window film over the light cover to cut the light down a bit, as that setup is used as a lionfish QT/growout setup. like I said, they work fine and go up easily, but since you're wanting to add a sump/fuge, you should go with a "standard" tank, as knowing what i know about them, I wouldn't have a PnP if it was my only/main setup.
I'm not a fan of messing with a non-CC substrate once it's established, but I do recommend using either #1 or #3 grade aragonite instead of sugar-fine/oolitic sand. It "lays down" much better (no sandstorms), looks really nice, and doesn't trap detritus like CC.