AVI to DVD? Why???!
With all of the negatives, roadblocks and time 'burned', my opinion is that without a really really great reason to specifically have DVD formatted discs, another method should be the answer to your post. Any number of options will be faster, easier, save space, time, quality etc etc... it really depends more on #1. what you want to accomplish and then #2. how best to arrive there - as opposed to, #2. How decided before #1. What is given consideration...
I used to do the same thing - DVDs from other formats to play on my old $300 DVD player... reading about the subject in frustration it became clear to me that other ways of achieving my desired outcome (play H.Theatre quality video with surround sound on HD Television) were far better.
I have used Toast 9 (not 10!) to burn HD and H.Theater DivX (about 1.5GB per movie) onto regular DVD+R's... 3 films a disk at highest settings, less time to convert, and now even menus, chapters etc etc. My old DVD player did not play DivX, so I bought a full 1080p upscaling Samsung player that will play about anything as long as it is shiny and round! It also upscales the DVD's I have making them look way superior to the results produced by the old unit.... grand total $74.00 tax and HDMI cables included. Many .avi files play as mp4s on the unit as well... so basically I try not to convert if I don't have to. I bought a second any-disc player from Phillips for $20 (about the cost of a small package of Dual-Layer DVD's! but no upscale feature!) - it works great for the older TV in the bedroom. I also give away the discs like hotcakes - no matter as they cost pennies and very little time...
I have also been using an older iPod Touch (32GB) connected to the television with a dock and component video cables - also a good option for certain stuff.
Lastly I have 2TB of drives hooked-up to a Mac-Mini which is connected to the home network, can be controlled from my phone, universal remote etc etc... it is a media center with the ability to surf the web, control home electronics etc etc from the couch. It connects to the BOSE via optical cable for super clean sound, and to the TV via Mini-DVI to DVI... so it is good.
Just some ideas anyways, best of luck!