i'm not sure what temps they get (GT's) but i do know they are changing the fan/heatsink design around as the first one isn't the best.
while this isn't the 8800GT 512mb version it's the 1gb, it does have a different heatsink, zalman looking even.
****, i forgot that those dam x38/p35 chipsets don't support sli, it never even crossed my mind.
but as much as i love the look of ek blocks and full blocks i would go with a gpu block only, upgradeability.