caj :
If 80$ isnt a big deal for the op and heat was really a issue instead of a lightening I could suggest the op to sink that money into a waterblock or 3rd party aftermarket cooler. Msi lightening doesnt justify for futur sli as those cards are often manafactured limited in supply. I would only suggest a lightening if the op has no budget issues or if he extreme overcloxking or living in a extreme climate where still d waterblock will do a much better job.
Really? This is getting to be silly, first, any 770 can SLI with another 770, they don't need to be carbon copies, so worrying about getting another N770L down the road is pointless. A single card solution is better anyways, especially given that since we're talking about only getting 1 770 now, OP won't likely get another for a couple years, at which point newer cards will have come out. Second, I've already said that $80 is the most amount of difference you're going to get. You could get the card RIGHT NOW for a $40 difference, and less with patience. Third the only point in getting a water block would be to go beyond 1350MHz, which a) you don't need to do, the stock air cooler is good enough, b) would be better off getting an air cooled 780 if you had the money for a water block, and c) you would become more limited by voltage and wattage than heat with this card past 1350MHz.