If you want to have enough light the first go round for anything you might throw in the tank I'd do 2x250W MH with T5 actinic supplementation.
The T5 allows you to run a MH bulb with better PAR but balances the more yellowy look of such bulbs and give you the neat dawn/dusk effect. Whether you go DE or SE is up to you, but if you are serious about growing stuff fast, I'd go SE which has a PAR advantage over DE at the price of compactness.
You probably don't need to go up to 400W MH with your tank. The heat and added electricity can't justify the increase in PAR versus a good 250 SE setup for a 25" deep tank.
If you want to keep things simple, there are a number of plug and play systems on the market including the Outer-Orbit fixtures by CurrestUSA, the Maristar by Sunlightsupply and omnipresent Aqualights by Coralife.
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