700 X 28 cheap tyre recommendations & will they fit a trek madone 2.1?

I'm after a new set of tyres for my trek madone 2.1 I am thinking of putting a set of 700 X 28 s on will they fit ? Any recommendations for budget/ mid price range? Or if not will try 25 s as currently run 700 X 23 X .
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Michelin Pro4 Endurance in either 700x25 or 28. Have run both and find them excellent. You might struggle with the 28's on your Madone. Hopefully there will be someone who has direct experience of the max size you can get away with on the Trek frame
Think CRC have PR4Es for £22 with tubes at the moment.
Also seen a few deals about for Vittoria Rubino Pro Tech 28s, Merlin have them for £17.50 each, another good choice.
You'll get good deals on both Michelin and Vittoria at the moment as both have introduced new ranges and retaillers are clearing stock.