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Stroker FTW!!! As Skip said, usable and reliable power, something you'll be hard to fine in any FI kit. Everyone claiming peak power and great powerband with FI is claiming so off their one time dyno pull, not street and especially track used applications! S2000 was made for the road course, and I'd only upgrade the NA capabilities of the motor to tackle such challenges.
Not to mention you'll be blowing by all the EVO's and STI's parked in the pits with over heating, over boost issued cars.
What kind of compression are you running with your 2.5L NA? and why? InlinePro has few choices on their web.
How much do you re-gain by seasonal EMS re-tune? I though closed loop EMS can take care of seasonal weather effect... I used to work on 13:1 NA Datsun 510 with Webber but no experience with EMS tune...
Mine is 12:1. I wanted something I didn't have to be overly ocncerned with. I just want to drive this year. I check my plugs and change my oil- that's it. Seasonal tuning isn't for gaining more power. It's for my peace of mind to know I'm running a safe A/F ratio. Getting a couple more ponies is only a bonus.
If one could leave a stock sc'er kit alone, I believe they can be reliable. Scratch that.... I know they can be reliable. The ramp up is relatively gradual compared to a turbo. Leaving it alone is the hard part.