One vote for Performance Ultras
I like Performance Ultra shorts for women. Ultra comfy (to me) and very reasonable, especially compared to Pearl Izumis and others of that ilk. See my review on www.girlbike.com. I would wear them on a metric or full century without batting an eye.
I use Chamois Butt'r religiously on all rides longer than about 20-25 miles. It really seems to help with chafing, though eventually wears off if the ride is long or sweaty enough!
What event are you doing at the end of April? Here in NC, I presume? I'm doing the Tarwheel Century in Elizabeth City the first Sat. in May. This will be my third year in a row for that one. It's flat, well supported, wonderful food, and a lot of fun. Good luck with your tri and first century!
Emily
P.S. It's a longshot, but are you the Kimberly who did the WOW ride in summer '03? A lawyer who works in Durham? If so, hi! I did the WOW ride that summer (and last, when it moved to the Duke campus area). I rode a Terry Isis the summer of '03, and you were just starting out cycling.
Emily
2011 Jamis Dakar XC "Toto" - Selle Italia Ldy Gel Flow
2007 Trek Pilot 5.0 WSD "Gloria" - Selle Italia Diva Gel Flow
2004 Bike Friday Petite Pocket Crusoe - Selle Italia Diva Gel Flow