I had a Primera Signature III inkjet printer (printer only - did not burn and stack). It cost about 900 bucks. The CD's it printed looked pretty good. The CD's were not at all water resistant. Thermal would be much nicer!
However, if their support of thermal products is the same as their support of inkjet products, I'd stay away from them. I had the Signature III printer and after a couple years of light usage it started having problems. I called Primera for service. They didn't support it anymore, and didn't have parts. They advised me to buy something new. Not what I call support. I won't be buying from them again.
I bought an Epson printer for a little over 100 bucks. It has a tray a CD fits in and it actually prints better looking CD's than the Primera did. The colors still run if you put the CD under a faucet, but it's more colorfast than the Primera was. For the price, I'm happy.
A duplicator/printer combo would definitely be nice but I can't see ever recouping the cost of one as the duplication industry is quite competitive. There are places that will burn quantities as samall as 50 to 100 reasonably. For smaller jobs, I'll keep feeding the computer and printer while I'n doing backups.