DONT get the Oceanic!!
On my first vacation dive, My Delta4 burst a first stage high pressure seat in 80ft water. Lost air pressure fast and had to make a 30sec ascent. After that scary event, I read extensively about diving safety and concluded that the guys on scubaboard are heavily into safety. I suspect that the "dry valve technology" is in its infancy and would not be allured by "advanced technology". I suspect that this had something to do with my "incident". Go with SAFETY and TIME TESTED always.
For piece of mind...I now have XTX200 with DiveRite BP/W setup.
After further research, you will debate b/t egress and bungied backup, but will most likely learn to go with a long hose primary and bungied backup. **Apeks does not sell second stage regulators by itself without charging hefty fees** I had to buy an XTX50Octo and convert the yellow pieces to make into a regular XTX50. If I had the option...DS4/XTX50/XTX50 seems the best time tested safe option.
If the LDS is not giving many options, call techdivinglimited.com They were the only ones I could find to give me what I wanted.