Conti 5000 are horribly expensive, if you're training to race and racing then I could understand the need for less rolling resistance, but in reality you will barely notice the 5000 over the some other tire; but the OP didn't say he was racing or training to race, he did say he wants to go fast but so does everyone else, that doesn't mean we all run over plop down $150 for one pair of Conti 5000 tires! Especially considering you can get Vittoria Rubino Pro Speed G+ for $40 that will cost you 2 watts over the 5000 TL or 1 watt over the non TL version, either way you won't feel the 1 OR THE 2 watts but you will feel the extra cash in your wallet! But going with tires that are faster you give up some degree of puncture resistance, so you have to weigh out what you really want. Also those rolling resistance tests are done with latex tubes, so now you have to buy expensive latex tubes to put in your expensive tires, though latex tubes can be put in cheap tires as well.