If you want a side exhaust you will have to look at the Aqualung Kronos, Poseidon or the oceanic omega regulators.
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I can probably let you dive the HOG setup upon approval of the little lady
I just want to point out that there is a reason why most octo's are different than the primary, and that reason is the very next thing you are looking for: Low Cost
The thinking is that you don't really need the best, high-flow, adjustable, super-amazing second stage for your backup that you'll likely never use but will pack with sand every time it falls out of the octo-holder and you drag it along the bottom to the chagrin of everyone behind you.
Add to that the fact that most service centers will set the octo to open and deliver air at a higher inhallation setting so that it doesn't free flow as easily. No reason to spend extra money for the finest second stage only to have it detuned so that it doesn't free flow because it's spending most of it's life unused.
The MK11 " Light" is a new lightweight forged body made of polished chrome plated brass. It achieves it's lightweight ( 1.75 lbs ) by reducing its size.I absolutely can't believe I'm agreeing with the beav on something, but the MK11 is also a great mid-price 1st stage. I don't know what the "light" means, but if its anything like the old MK20UL, forget it; just get the regular MK11.
I still say HOG with a cold water first stage. I have seen the water hit 43 degrees, on what was Adeline's second post cert dive in Mendocino. We often see 48 degrees and I consider it no big deal to dive in. By the time you are ready to buy they should have the yoke fitting back in stock. When ready call Mike or Jim and see what they can do for prices as DRIS offers a kit with all needed hoses, and SPG option, and a yoke adapter you wouldn't need if you "permanently" converted it yoke (You keep the DIN fitting in case you ever wanted to go back it).
HOG Gear DIN to Yoke conversion Kit - Dive Right In Scuba - Plainfield, IL