Have you go a local independent department store near you? Lots of them tend to stock a real range of makes including all those on bravissimo etc - if you are an E cup I'd go for anything by fantasie or freya - I'm a 34E and after years of research wouldn't find a better fit from any other make - they definitely give the best support and shape.
I would recommend giving their moulded t-shirt bra a go as it seems to come up slightly larger (perhaps because it is moulded) and therefore it wouldn't notice if you have uneven boobs.
yup, take the bra that fits the bigger tit and stuff a chicken fillet into the other side. And if 32E gives you a double boobage on left side, you have to try 32F. moulded is a good idea as well, like blabla recommedned, again take the size that fits the bigger one.