Have internal Pioneers on my Mac Pro towers but I also have external USB powered Samsung SE-506 (Made June 2012, cost $50). The later models only require 1 USB port whereas mine required two.
Here's some tips. DVDs / Blurays typically play 4.5 / 16 mbps but on important jobs I will encode at the maximum hardware stream rate by pushing the encoding to 9.0 / 26 mpbs. And, yes, you can tell the difference. I always export at ProRes 422 or better and never use h264 as the master file for disc creation. DVDs encoded at 9.0 mbps will only get you slightly over an hour play time but if you need more time use a double layer disc. Be sure your file is mastered 'progressive' and the disc encode setting is also set to 'progressive' lest you enjoy interlacing lines on playback.
1080 is miles ahead better on Bluray than a DVD. Colors are richer and deeper and presents more closely to the file you slaved away at creating. Think of it this way... A one hour ProRes 422 file is 66GB. Mastering it to a 4.3 GB DVD throws away 85% of information to get there whereas only 39% is lost by mastering to Bluray.
One caveat, though... If the event is using an OLDER player it may choke at playing a 26 mbps Bluray stream. I have my clients preemptively test on the location equipment prior to the screening. As a precaution I loan them a tiny Sony BDP-S185 player that I KNOW works with the disc I create for them so if things crater during the presentation it's the venues outdated playback equipment. (This player will display the data stream rates while most other players won't. Cost $45 maybe 6 years back.)
That's only a PLAYER, not a BURNER. You'll need a BURNER to CREATE DVD or Bluray discs.
You can create a HD Bluray that will play on a standard DVD but the length is limited to 20 / 40 minutes on a single layer / double layer disc due to the better quality HD content. A standard DVD burner (red laser, purpleish media, 4.4 GB) can create the HD disc but will need a BLUE LASER (Bluray) burner to create a Bluray disc (brownish media).
You don't need a multi-region (NTSC/PAL) player unless you typically get foreign (to your home system) discs, Computers will play PAD or NTSC discs either way. If you have a computer hooked to a TV then that alone will suffice.
Streaming should be the last resort. Not only are there interruptions the connection may only play back at 480 resolution, rendering your glorious production looking like crap. An h264 file on a thumb drive would be superior to anything streamed.