The Keydiver chip you need is not dependent on boost levels. It is only dependent on your fuel pressure, air metering (1g, 2g, 3g, GM, VPC, etc), and injector size and a few other small variables.
Swapping to a 2g style intake with a 2g MAS is worth a LOT of power, and is quite easy to do. Even a bone stack car will see a huge difference in spool up time and power with those 2 mods and trust me, if you plan to do any mods at all this should be on the list.
Anyway, that is why I recommend doing the intake/injectors/2g MAS, and keydiver chip all at once, obviously after you've checked the ECU. Once you have those base mods, you'll never have to get another keydiver chip unless you go with even bigger injectors. Even so, Keydiver offers a special deal on return customers.
I ran the same Keydiver chip for 3 years and you can be sure that the car kept getting modified, and just now did I upgrade to a new chip, because I was maxing out my Evo 8 injectors and decided I needed larger injectors.
The next thing I would do for your car is add an AFPR, and only after that would I think about doing other mods. Get your car in a proper state of tune before raising boost!