easy question...

You can't get any of those new models since your motherboard is a socket 754. That's a quite old motherboard. Personally, I would not even buy a new processor for that socket; not only is it not worth it, it'll be hard to find.
 
You might as well just save up and get a newer motherboard and cpu. There aren't really any good processors that are sold anymore for Socket 754, so you should probably upgrade to AM2 or LGA775 before you put money into a new processor.
 
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