If you are looking for a long distance tire that fits the budget, the Ultra Gatorskin wire bead tire is a good choice. The same great tire as the folding Gatorskin except the wire bead adds a little weight and saves a bit of money.
Continental likes to refer to the GatorSkin as the "Kilometer King", meaning that the special formulated, high mileage tread will last many, many kilometers. Conti's protective GatorSkin mesh casing layer completely envelops the casing offering an added protective layer which protects the sidewalls from wear and damage and also adds another layer of puncture resistance under the tread.
The Gatorskin is a perfect choice for a long lasting training tire, century riders and for any rider who are logging massive miles. The quality 3 ply, 180tpi casing offers a smooth ride quality while the black rubber compound offers superb grip. The Kevlar strip under the tread helps offer additional protection from debris on the road while not adversely affecting performance.
Great training tire. I prefer the 25c version which rides a bit softer than the 23c. They last longer than any other clincher tire that Ive owened and so far have yet to puncture or pinch flat.