First, speak apocopate English so we can fully understand your request... Second you would want to get everything new. Don't just buy 1 or 2 parts at a time, it never ends well. Third go AMD. If you would like a build, just ask.
With a OEM motherboard, the processor WILL have to match the motherboard, so no just any'ol processor will work. I don't know if it is vice versa because anytime I have replaced the motherboard, I have replaced the CPU as well.
Honestly, The A4's have fairly good processing capabilities (probably double what you have now) and actually don't fair bad in video environments, usually comparable to a dedicated 5450 (512mb model)
i did pretty well last year on black friday 40 dollar p67 SLI, pent g860 (45 i think) and another 19 for 8gb 1866 ddr3. (pc i built for brother in law after i trashed his p4 mobo) so like you said, about 100 bucks.
(i also threw in a 75 dollar rad 7770- rebates rebates rebates.... hey wait i still haven't got them back yet.....lol)
hopefully i'll be able to snag a decent 250gb ssd at that point too just a tad too pricey right now, and 120gb i fear will be too small. (course i'm already using all the bays in my case so i'll need a new of of those... and a non oem psu... oh back to the drawing board lol)
ill just wait til black friday again. funny thing is, toms best cpu for money was the g850, but that was selling for more than the 860 (perhaps toms guidance increased demand that much?)