I'm looking into belts at the moment.
I have just got a sample AT5 pulley & belt from Beltingonline.com, Supplier of power transmission and conveying products

It seems ok, but a lot of people here seem to use HTD pulleys and belts so i might order a sample one of these to have a look at too,

Photo of AT5 belt on 44 tooth pulley
Click image for larger version. 

Name:	P8312079.JPG 
Views:	6507 
Size:	155.4 KB 
ID:	9932