Here is my setup. I feel like I got lucky and bought the perfect sized tank for a pair of clownfish and an anemone. I have a 58 gallon tank. A lot of people will tell you that you need VHO or MH lights to keep an anemone, but that's not entirely true. You can keep a bubble tip anemone under pc (compact florescent) lighting in most cases. But that's just my opinion; a lot of people disagree. Regardless, it will be several months before you can keep an anemone. There are a few reasons for this. First, you will make some mistakes, and anemones won't survive the mistakes most of us made early on. Second, anemones do not tolerate poor water quality, so you'll want to perfect your water changing and testing procedures before adding it to your tank. And finally, it is said that your tank should be well "established" before adding an anemone. There isn't a specific time line, as some tanks mature faster than others. But I'll tell you that most people who add an anemone prior to six months aren't successful in keeping them alive. The fish you want aren't completely unreasonable like most (including me) people who first get into the hobby. I would recommend a 45+ gallon (if you want a single clown) or 55+ gallon (if you think you'll want a pair), wait to buy the lights until your tank is ready for an anemone, and start by adding the cloudy damsel you want first. The three latter fish you mentioned (butterflies, tangs, and angels) are three of the more difficult species to keep. I would stick to your original list, and you will still be able to later add two reef safe fish after you've had time to do your homework. Good luck!