A DLT recorder cost from $500 upwards of $10k+ depending on where you get it and brand.
With DLT you have seamless integration with the replication stage to ensuring that there are no delays, in restoring the image file, and verifying it for glass mastering.
The simpliest way is to create your project, put it on DVD-r (DVD 5)or if it is for a DVD 9 copy it back on MiniDv/Beta format tape and send it to someone like http://www.now-multimedia.com and let them convert your tape or dvd to DLT.
If you have the extra $2k - 10k just laying around for the setup go for it, But I would use a DLT service, sometimes for under a couple hundred bucks, depending on size of your project.
I have personally had a couple DVD's replicated from a DVD-R high quaility media, there is a considerable time differents between having a dvd replicated from a DVD-r and a DLT, but that was a couple years back