What size is your tank? Try to think less about needing just specific watage and more about spectrum I'm not discounting the need for watage, but people seem to forget how shallow these Nano's are they have no need for max lighting, I've even had a brain thrive in a nano with just PC. If I were in your shoes I would get a 10k bulb or a 50/50 6,500k and Actinic combo, that will be sufficient light to keep some Zoanthids and Star Polyps but even your standard 5k lamp that comes with the national chain light fixtures will be ok (just not optimal). After saying all that I do think you would be happiest with some good 50/50 PC lighting, you will see colors come to life. My suggestion is to get a frag of some star Polyp from your LFS (mine sell frags for around $5) and test it out, if your happy step up to Zoanthids could even try a mushroom. By the time you've tried a couple out maybe you can get a little PC setup. Doing this you can learn what you can keep with out going in the hole.
Best wishes.....Joshua