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A tunable ECU is never a bad idea, especially for checking engine health and fine adjustments for Canadian fuel/elevation. Plus, when power gains become more of a priority, you'll already be set up for it ECU wise. From what I've learned, the Link seems to be the best drop in style of ECU right now. Combines the ease of a Power FC, but has modern fail safe parameters built in that the Apex'i unit doesn't.
As far as the SR, cooling is the biggest thing with these engines. Radiator, new water pump, fresh coolant flush, and a thermostat are big on the list. The clutch fan gives the most consistent temps, but takes up more space..so it's a trade off. If you can afford it, a good oil cooler setup will help.
Valve float/colapsed lifters is more common on the older SR's, but still something to look into even on the S15 model.
General maintenance for a 20 year old car should keep you busy enough at first. What fun is a bunch of shiny parts if the car keep breaking down for little stupid stuff.
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