If you’re interested in listening to the NT in Greek, and if you prefer a modern pronunciation, you’ll want to check out the new (to me, anyway) FREE resource at Bible.is. It’s the entire NT in Koine Greek (the 1904 Ecumenical Patriarchal Text, which is based on Byzantine MSS).
The site has a very convenient interface that lets you choose what chapter you want to listen to and also displays the Greek text. In addition, there’s a feature that appears to let you download the entire audio bible if you wish.
The audio quality is quite good. The reader goes rather fast, so if you’re looking for a slower reading or one more convenient for using on the run, you will want to check out the recording by Spiros Zodhiates, which I’ve noted elsewhere on this blog and which is available in mp3 CD for under $20.