If you just want the Greek text without the translation, you should have a variety of options. Oxford Classical Texts and Cambridge Classical Texts should have what you need. They often print the title's in their Latinate form, so that may hinder your searches. I don't know of another series of dual langauge English-Greek texts off hand. There are sometimes other dual language versions available of specific texts.
Oxford: Aristotelis Metaphysicahttp://www.amazon.com/Aristotelis-Metap ... pd_sim_b_3
The downside is that Oxford and Cambridge editions tend to be quite expensive. Oxford editions have introductions, but they are purely textual in nature (regarding manuscript transmission, variants, etc.), and often written in Latin.
As for English translations, I don't know much about the best translations, but you should be able to find a variety of them on Amazon or in libraries. You might want to steer away from older translations if you're bothered by those in the Loeb series. Most of the Loebs were produced almost a hundred years ago, so their translations can be iffy... not necessarily incorrect, but perhaps stuffy, uptight, or eccentric. They have been reissuing some Loebs with new editions/translations, so you may find those more to your liking.