cpu speed isnt the only important factor in terms of performance.
some cpus perform better in different applications than others. and other cpu's are just better all across the board.
theres lots of factors to consider but for what snapcrackpop wants, i think waiting a bit longer for the 6-core intel cpu's would be best.
though there are other options.
i havent really seen that many benchmarks for the latest amd cpu but i remember they have good performance in multi-threaded applications.
intel current gen offerings arent bad either and perform better in different areas. and they have the added benefit of having integrated graphics which cut down on price.