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This is just an observation but you seem set on mods that might be excessive for your plans. I'll start with the top your last replay and work down.
At speeds of 100-125 you won't be running anywhere close to the rev limit on an Evo unless you never leave 4th gear for that entire time. (not a good way to stay in the race on any car) If this is a highway race then I will assume you will be spending most of that time cruising in 5th trying to maintain your position in the pack. At that speed and cruise you won't be in boost until you decide to pass or need to accelerate.
The only thing a thermostat does is determine when to allow the antifreeze to circulate through the engine/radiator. That is all. Once that temperature is reached it will remain open until your car is shut off and cooled down. I don't see why you think you'd need to replace the stock one as it works just fine. If improved cooling is what you need a thermostat will not help you at all with this race.
Without knowing more about the aspects of this race I can't really give a good solid opinion on cams/turbo. All the ones I mentioned before sound really good for short sprints and extended driving. A larger turbo is only good for helping you accelerate faster at higher RPM but won't do you much good down low. If straight highway driving is all you're in for then I suggest staying with a 20g equivilent.
One more thing about cams. Unless you plan on running a GT30 or higher I don't recommend 280's. You won't get much gain over 272's. Raising the rev limit won't do you much good either as the smaller turbo's just aren't efficient above 7K. Even my AMS 50trim starts to fall off after 6700 with 272's.
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