last I checked coolers from GTM and stillen come with thermostatic plates. However, it looks like while the plate doesn't fully open until 180+ it never fully closes either. I think I read on here that it closes up to about 90%. I recently installed the GTM 25 row oil cooler and yes I will say that it is probably way to big for New York fall and winters. I bought it because I didn't want to have an insufficient cooler for when I went to the track, the HD just wasn't big enough.
Before the cooler I saw the temp up to 250ish when I really got on it. Most of the time a little bit of spirited driving had me sitting between 220-240+ all day and that really pissed me off.
Get a cooler, the Z needs one, the size of the cooler will depend on your intended use of the car. I'm sure eventually either GTM or a fellow member can construct a shroud for you.
BTW: what temperature is considered overcooling?
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2009 Carbon Fiber/Red 370z aka Trish: Sports Package, Meisterschaft full catback, Fast Intentions Longtube Headers, Injen Long Tube Intakes, UpRev Tune: Sold 
2008 Lotus Exige S Club Racer aka Bella, always leaves me smiling
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