I used to use NeroVision which should convert the avi's and make a dvd structure, but i found it unreliable, didnt sync av/audio problems properly and didnt offer much in the way of quality..
I then tried ConvertXtoDvd, and have used it for the last 2 years, its fantastic to be honest, easy to use but pretty powerful if you want to make custom dvd's with fancy menu's etc.. and best of all its pretty cheap if you decide to buy it...
Its well supported, regularly updated and has a forum for support..
You can download and try before you buy...
http://www.vso-software.fr/products/...ngate&aid=2202