The 50/50's are just half 10K (I think) and half actinic... so either way you are getting the same kind of actinic. I would say if it has 2 switches/wires (I can't remember), that you should get the actinic bulbs separate from the daylights so that you can run actinic only before and after your daylights are on... plus it is just fun to look at tanks with actinics only from time to time.
And I didn't mean to imply the PC's were a bad option. As long as you are pretty confident you'll stick with shrooms and zoas I think it will work just fine and you'll still get pretty decent fluorescence out of the actinics. Remembering talking to you, consider these another "cheap mistake" if you don't like them. The only ways I would talk you into another option is if $$$ isn't a concern or if you are fairly confident you'll be upgrading tanks or switching your stocking list to something that requires more light.
Most softies, mushrooms, and zoanthids don't REQUIRE a huge amount of light, but most of them also tolerate higher light and may even grow better in some cases, so I always recommend people go for T5's (or halides) if they know they'll want to keep SPS in the future... it ends up cheaper to not have to upgrade in the long run.
