The posts about greyhounds above are generally correct, although some of them love water. A lurcher would be a better idea, although it would depend on the cross, they have more stamina, but can be just as lazy when not out and about. More prone to liking the water, although their anatomy means they are often poor swimmers.
A case in point is Ted, loves water, hates to swim:
As Anagallis said, Lurcher Link is a great site for available dogs and advice, as is Greyhound Gap (who saved Ted)
Great pic there Samuri, reminds of this one of Ted. Two very different dogs (Ted is nearly 3 feet tall at his ears) but they look so similar.