Trillionaire,
The Berlin Turbo is good for up to 250 gallons and is a good skimmer. I'm not falimilar with skimming tanks that large so there may be better skimmers when you get to tanks of your size. I'll leave that to someone else to address.
If you want to use the Turbo, you have to use the proprietry HYDOR pump that comes with the setup. It's the pump that makes it a "turbo" if you will. If you want to use your own pump, buy the regular Berlin. The skimmers are both identical. The difference is the turbo mixes the air in the pump and the regular berlin has a venturi that puts air in the water without using the pump.
I hope the problems are fixed with the third generation impellor. I put mine in, but only time and few power failures will tell.
Overall, I like the Turbo a lot. It makes tons of tiny bubbles and removes a lot of crud.
Tangman