You've already got a practical car in the form of your wife's crosstrek. A Civic SI sounds kind of redundant, unless you go for an 8th or possibly 9th gen. Get a BRZ.
If the BRZ had 50 more HP, it'd be in a different price bracket and I'm not sure how many people would actually cough up the $$$ for it. Power is not cheap, light-weight is not cheap, having both is extremely not cheap. The S2000 had almost 250hp with light weight and that thing was pretty expensive.
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