Yeah, I figured. They're trying to phase out socket 939 by jacking up the prices...
Yes, it's a great processor. What exactly are you using it for? No matter what, it should be great for most applications. It's a pretty big upgrade from a 3000+.
The problem is, you could get a great Core 2 Duo that would blow the Opteron 180 out of the water for the same price. One thing you could think about is upgrading your motherboard, processor, and RAM. You could get a Core 2 Duo or just an AM2 setup like this. You could easily do it for about $300, getting a new motherboard, faster processor, and 2 GB of much faster RAM.
Here's an example:
Abit IB9 motherboard - $90
Core 2 Duo E4300 - $120
2 GB DDR2-800 G.Skill RAM - $90
The total is $300, and it'll be a huge difference from your current setup.