This is not advice about which computer to buy, but if you don’t like the moving/blinking ads, why don’t you use Firefox and use the add-on of AdBlock Plus. I have NO ads whatsoever on this site or any other. 1,2,3 and they’re gone. Nothing more to slow down my computer.
Now for the advise, I would go for the first system since it comes with Windows 7 already and a lot of the new programs aren’t made to work with XP anymore plus there’s double the memory and the processor is a higher quality one plus you have 50% more of a hard drive. For sure worth an extra $85 in my opinion.