I read and really enjoyed the first three Sentients of Orion books (Dark Space, Chaos Space, Mirror Space) by Marianne de Pierres when they were released a few years back, but I never got around to reading the final in the series, Transformation Space (though this is now a firm reminder!!). The series is soon to be released in the US as ebooks through Ereads.com, and here are the covers to go with them:
And the original UK covers:
I must admit I do prefer the UK covers, but the US ones aren't bad at all. They do look more like Sci-Fi Romance than Space Opera, but that might be just me.