If you were upgrading a I7-920 watercooled setup

2011-SBE or 1155-IB ???

Not really keen on pushing 1.55v into it when only running chilled water (this thing is even hitting 75c after 20min of Prime @ 1.35v with 10c water)

Those kinds of temps long term (since I usually go 2-3yrs before upgrading) doesn't sound appealing.