Text to speech in Storyline lessons

I too have looked at speech synthesis for e-learning. The Captivate NEO voices in  captivate 5 and 6 were usuable, in particular the female voice was ok ish. But many clients throw their hands up in horror when you mention artificial speech.  I just did some googling and came across http://www.naturalreaders.com which seems to have a solution with a choice of Acapela voices (the UK Graham one sounds reasonable) for around £100 or so.

I see that Storyline outputs all its text as a word doc file so it should be possible to do a bulk conversion.

But in truth none of the voices sound convincing to my ears and you lose all the nuances and word stresses  that adding voice to e-learning should provide anyway.

If anyone has any suggestions I'd love to hear them, meanwhile Maplin do a great USB Podcast mike for £40 - sigh.