I'd never trade PC's flexibility to MAC's "reliability". Get a good, I mean - good (have I mentioned "good"?) hardware, install XP Pro, and then tell me you have to reboot your PC every minute. Most PCs are mass market crap from hardware perspective, so why would you expect them to perform better then $200 home theatre? MAC has consistent quality just because it's made by... MAC, don't compare it to Wal-Mart or "white box" PCs, but rather to ones made by IBM or the like - expensive and of high quality. As for Windows, again, it's a trade off - you either get simplicity, which is often perceived as reliability; or - flexibility.
Disclaimer: unfortunately I don't have any connection to Microsoft.
Disclaimer: unfortunately I don't have any connection to Microsoft.