The 148 may be 2.2ghz, and may be a pretty good overclocker itself, but its no dual core. It depends on what you use it for - there are many games/programs currently available that are not yet, shall i say, optimized for dual core processors. I would imagine that, certainly by the end of this year, many many more people who are buying computers now will be on dual-core systems, and that software designers will be working to put out products that take advantage of this - games included. AS somebody has already stated, when this happens, there will be little question which is the better choice.
But even now, the 165 is certainly not a bad performer in games - very, very good, in fact.
k2000k - The x2 price was dropped b/c the opteron was by far the better deal (for oc-ers) than it when they are around the same price. Even at this price, I would seriously hesitate to buy the 3800+, since I could pay about $30 more for a chip that would give me a significant boost over what the 3800 can do. (I do media processing, so I appreciate the extra speed/time saved. Others may not.)