No problems with that Johan! You can achieve a LOT with T5's. But whether you go metal halides or T5's, I think this would be YOUR decision.
Metal halides give an awesome "shimmer" effect to the water, and they also penetrate deeper water better. AND Corals love the lighting of metal halides.....
BUT, just as great success have been achieved by using T5's in the past as well....
You could perhaps have ie 8 x 54 watt T5's in your tank (6 white and 2 blue), or alternatively go for ie. 3 x 150 watt or even 250 watt metal halides.
The Metal halides option would give you more wattage per square foot.... BUT, they do generate a LOT more heat and uses a LOT more electricity.
Metal Halides globes generally lasts up to 2 years.... where T5 globes (depening on brand) lasts from 12 months to 18 months per globe....
You can experiment a lot more with different white colorations (different Kelvin rated globes) having more globes in your tank....
Still - as long as you have high output globes, and enough wattage per square foot to satisfy the corals and anemone's requirements, then I am cool with whatever you choose to go for!