A few years ago, I figured that if I'm going to be serious about triathlon, I'm going to need a serious triathlon bike. So after a year of consideration (hey, am I really serious, or what) and checking out several other bikes, I decided "yes, I'm going to be serious" and bought this bad boy:
This is my 2007 Cervelo P3 Carbon (aka P3C) with Dura Ace crankset (replacing the stock FSA crankset), Ultegra brakes (replacing the stock house brand Cervelo brakes), VisionTech R-bend carbon aerobar clip-ons (replacing the stock alloy clip-ons), and a pair of Zipp 404 clincher wheels (not dimpled, but cool black and white logos that match the bike), and a Profile Designs Tri Stryke TI saddle. You also see the XLab FlatWing behind-the-seat bottle mounts and CO2 cartridge mount system.
Since I took this photo, I've raised the seat 5mm and flipped over the stem, lowering the aerobars about 10mm, giving me more of the "drop" necessary for an efficient aero position.
Every time I ride this outdoors, I'm stunned by the difference between this and my 2003 Trek 5200. It flys downhill effortlessly, it glides along on the flats, it's just flat out a fast bike. I'm definitely serious now.