On a reliability basis: Seagate hard drives
My first pc had a 4gb drive which i then added a 13GB drive to
the 4gb drive died twice (failed, then warranty replacement drive also failed) the 13GB failed and got warranty replaced too.
skip forwards a few years: Had been reading consistently good reviews of seagate drives so thought i'd give them a second chance. Brought a raid card and 3x 500gb seagate drives. Drives were the loudest i'd heard in years, 2 of the 3 drives failed within a year.
skip forwards again to recently: gave them another go for a hybrid SSD drive, drive failed after a year and a half
In the same timeframe, i've only had one hdd from another manufacturer have any problems (maxtor drive that whilst had some bad sectors, still worked fine for many years)
On a performance/driver basis: my first ever PC's motherboard + a creative 3d card
The board was terrrible, but the onboard graphics on the motherboard stood out for amazing crapness... Software rendering was many times faster than hardware-accelerated mode for quake2 on the SIS chipset for example
As the motherboard had only PCI slots, i upgraded to a PCI creative S3 savage4 card... which is where i learnt of creative's reputation for terrible driver support
Combined the two were a complete nightmare, but did teach me a lot about PC troubleshooting. This helped me get an IT helpdesk job later on so it's not all bad