Okay here is my take. your bm dresses are a bright pink/coral color right?
why not do roses with some cymbidium orchids? green goes really nicely with those colors.
for your bouquet I would do something more dramatic. All roses, roses and orchids, or perhaps all white callas (which I am obviously partial to)
I like gerber(a) dasies, but to me they seem a little more informal. Definitely cheery and fun, but if you are going for "beautiful flowers" I may go with something with more drama.
I didn't spend a ton on my flowers (granted, I didn't use a lot of color either) but felt like what I did have really made an impact. My florist was really reasonable. I can give you more info on what I paid if you are interested but I know that, for instance, my all white calla bouquet was only $65 - originally quoted as $300 from Elena Damy