Not a Short, go for the 939 for a desktop system. It does not matter if 754 is EOL'd because you will still be able to get memory, etc., which is the same parts as a 939 system. (Actually I expect 754 to have a long life because it plays well in cheap markets where they only want to populate one memory DIMM.)
There isn't a lot of price difference between a 939 and 754 desktop system at similar performance ratings. Memory bandwidth is key to performance, and expect software to continue to be abusive of available performance improvements. This means that tommorrow's software and add-ons will start to look slow on 754 systems.
That is why I suggest 939. Going for the low end has never really paid off for home users, they always seem to add stuff to the machine to stretch it. 754 is fine for standard office machines, the home user is more demanding.