There's no perfect system, everything has a drawback. Neither of our two tanks are drilled and both are using the hang on siphons. They have issues with salt creep on the hoses, and they get gunked up with algae, but thats about it.
The ehiem we ran for about 2 years before we swapped it out from the reef to the fowlr. Its not that hard to unclog, but it is a heavy mother (full of water) to have to drag out from under the tank, especially when you have alot of your supplies stored under there as well and have to move it all around. It was one job I didnt look forward to.
I honestly think you could get by with your current setup. The remora is a good skimmer and if you keep the filter media pretty clean it will probably keep up with the waste. I used boyds chemipure on the fowlr tank in a small hang on filter and the water was crystal clear. Wet-dry filters are going out of fashion and from what I see, most folks are relying on the rock and a good skimmer to do most of the pollution control. Good Luck.