That's a really nice price indeed! I had to pay around $500 for mine.
From what I've read, the 800 FSB 2.8 GHz and 3.0 Ghz CPUs are the same with the exception of the clock speed.
Check this page: http://www.digitimes.com/NewsShow/Article.asp?datePublish=2003/05/02&pages=04&seq=18
My system: AMD Athlon XP 3000+ CPU / TwinMOS 1Gb DDR400 / Soltek 75FRN-RL /
Sapphire Radeon 9800 Pro / Antec True Power 550W / Maxtor 80Gb ATA-133 / Hercules GTXP SC /
Samsung DVD / Lite-On CDRW