When I was talking to my engine builder He recommended I stay with the 160 I was already running. weather it's a 160,180,195 I like the robert shaw high flow stats myself. they are less restrictive and I run a high flow water pump.
There are a few benefits to living in southern CA.. Whats this winter everyone keeps talking about
On another note the new yukon temp runs at 210 and thats normal (better emissions, fuel efficiency, etc. I assume) I cringe when I see it though.