The next major platform for AMD in Q1 of next year. The biggest change would be the migration to DDR2.
You are indeed in an interesting situation. For example, since I am using socket 939 which has access to all of AMDs current cores I intend on skipping AMD and DDR2 unless they impress me otherwise. You also would be looking at an AGP card, and buying a new one would be silly at this point.
Since you don't have any intention of overclocking though, save your money