Rebuilt my old 2000 R300 CAAD3 which I got in 2007 and rode all the way up until 2021. It started life as an 8 speed triple bike with a mix of Tiagra, Sora and lower Cannondale in-house CODA parts. It didn't take me long to upgrade everything to Shimano 105 and that's how I rode it for over a decade.
I retired it when I realized it was actually a bit on the small side for me. That frame is a 58cm and I'm most comfortable on a 61-63cm. So, it got scavenged for parts to build up a different, taller bike. It was collecting dust until a friend was ready to get a decent road bike. The plan was actually not to use this frame but rather a similar sized LeMond I got for cheap from a friend. Well, got that built and realized the head tube and downtube were bent. Didn't notice initially because I bought it without wheels. Whoops. All the components were still good so my friend gave me back half the money to compensate for the bad frame and I swapped everything over to this R300. The LeMond was red, hence the weird red bar tape and cable housing.

Now, the component list is mostly Ultegra with an FSA compact double crank I had laying around and very lightly used Aksium wheelset I got for 100 bucks. Yes, it's got mtb style flats and not clipless. This will be for a friend who will be using it as his one and only do everything bike and isn't into clipless pedals so, flats it is. Bars are some cool NOS Salsa Bell Lap cross bars I got for cheap last year.
I rebuilt every component and did my best to clean out and lube the shifters. All the consumables have been replaced with new parts, so chain, cassette, bar tape, cables, cable housing, brake pads and tires/tubes. I want my friend to have an effectively new bike for a fraction of the cost. All in, I think I've spent around $260. Should last him a long time.