I have large breasts (E when not pregnant!), and went bra shopping a few weeks ago. I decided, given how expensive good bras are, to just invest in a couple of nursing bras without underwire. They are really supportive and pretty comfortable--although sometimes the band can dig in a bit to my rib cage. Overall, though, I felt good about just going straight for nursing bras instead of maternity ones that I won't be able to use once the baby arrives and I turn into a milk bar.
Oh yeah, and the brand I bought was 'Anita', which is a European brand.