First off.. Welcome to DSLR
Definitely forget about the Celery.. not so hot
Truthfully you will prolly never see a difference between the Intel and the AMD... They are both as good as each other... If you plan on doing intensive video editing, CAD type 3d rendering, etc... (which I doubt you are since machines appear to be pre-built).. Then AMD should serve you greatly.. Only thing I would recommend would be to upgrade the memory on the AMD to 512MB instead of 256MB... 256MB just isn't going to cut it now a days IMHO... But 512MB is plenty
Now.. one more question prior to saying definitely AMD.. what is the motherboard that is going to be used in the Intel and also which one in the AMD? Also, what brands are they?