You can never go wrong with Arko, it's just really expensive! Seems like a lot of people on here, including myself, are very happy with the Graves system for a fraction of the price. The CAT definitely has to go though (weight reduction bro). Brock's Predator and Alien Head slip-ons are also a fraction of the price, sound amazing, and are proven to give you sweet gains. You can also customize the Alien Heads. I would ship the ECU to Brock's and have them flash it too with all the $$ you saved by not buying that Akro.
In terms of the suspension someone recently made a post (weighing about the same as you) who's looking to DIY-upgrade his suspension. Might be something worth following to see how his results are. My guess is you're definitely not going to get far on the stock suspension though because you likely weight 20%+ more than Kawi's target weight.
When in doubt... send it!