I'd say go for the vortech over the 2 returns, for heat and for the health of your livestock, but at the same time, it may be overkill for your tank.
If you're not going to have a controller for your tank, get the regular MP10, not the wireless, it's a little less I believe. What you're paying for is the random flow factor and the ability to change the intesity to whatever you like or your corals like.
With return pumps, they're only going to push in one direction at one speed, whereas with the Vortechs you can have them pulsing between high and low speeds at a range set by you, or going up and down randomly throughout the day, much more like the real reef. It's up to your liking too, You could get a couple of Koralia nano's and a timer or two and have them alternate too I think.
I used a Build my LED 1' fixture over my 10 gallon and I had to move a piece of SPS down because it was bleaching, so it definitly puts out some light. It would cost you more than the additional fixture that matches yours though.