Thank you but unfortunately I cant find the TYGR 300 R anywhere in canada. it wont ship from their stores either. so frustrating.If you're focusing on competitive play, the 880 would be the best option. I've used all headphones you've listed other than K702. The 880 is bright (some people don't like this), but that makes them even better for competitive shooters because sounds like footsteps are emphasized. It also has near the best imaging and sound stage you'll get in this price range. The 990 is a bassier headphone, which is more "fun" for casual gaming but not ideal for competitive. Unless you're able to find a 32ohm 880 though, the most common sets I see for sale (used and new) are 250 and 600, which means you'd need an amp to drive them to get their fullest potential.
My personal preference for competitive (and some casual) gaming is the new Beyerdynamic TYGR. They're a good mix between the 880 and 990. And the imaging is amazing. It's also 32ohm, so it works well with console controllers. If you're budget can stretch to this, I highly recommend it over all other options you've mentioned.
As for V-Moda boom pro compatibility, I was in the same boat as you. I used a 9500 for a few years thinking I didn't really have other options, but I've since learned more about the hobby. For the Senns, you can get an adapter or a different boom mic cable that fits the 2.5mm jack it has, which is a plus. The Beyerdynamics can also be modded to use a detachable cable. Just search "beyerdynamic detachable cable mod" and you'll get plenty of hits. It's easy enough to do if you have experience soldering, but Demevalos (who wrote one of the guides) offers the service for $75 through his Etsy store.
I currently use a TYGR with the detachable cable mod for both PC and console competitive gaming. Highly recommend it. It is a little pricier, but if you consider the price of an amp if you went with the 880, or the price of a desktop mic, then it's comparable overall, and even better if you're able to do the mod yourself.
EDIT: I also use a Soundblaster G6 amp/dac with my PS4, though I've used the TYGRs with the controller too and they still work great.
As for the 880, is 32 Ohm worth it for my needs? (gaming). I dont care about listening to music or movies.
Should I just settle for the 9500?