Suggestions for piano pieces to be played at a wedding?

My aunt will be having her wedding near the end of august, and my sister and I are searching for piano pieces to play for her wedding. My aunt said that the priest suggested Canon in D by Pachelbel (beautiful piece =D), so now we still are looking for a Classical piece and a Triumphant piece for her wedding. Are there any suggestions for a classical and triumphant song that would fit great for weddings?