I'm looking to replace the Kendas that came on my bikesdirect bike. I'm thinking Vittoria Randonneurs, especially for the rear because I've heard that for the price ($30) they are the most durable and best for skidding. I'm wondering, will getting 700x28 (compared to 700x23) make the ride smoother and help prevent flats? I have enough clearance for them. And do you guys have any other recommendations for durable tires in that price range?