Why don't you like AMD?
Intel has some amazing high-end chips, it's true. As far as pure bleeding edge performance Intel has the crown. HOWEVER, that doesn't mean that if you buy these old *** Wolfdale core chips that you've got a good processor. It means that you followed Intel regardless of price and bought something 3 years old because of its brand.
Let me ask you something. If Intel put their brand on a bag of dog **** would you buy it? I'd be willing to bet that many people would.
With that being said. AMD has a big lead in the price/performance category. The difference between that Athlon II x4 and those Wolfdales in terms of performance is the same (or very very close) to the difference in performance between the Core2Quads and the Core2Duo's. Athlon II x2 performs very similarly to Core2Duo at the same speeds, and AMD is much less expensive. Not to mention the fact that this is not an Athlon II x2 you're looking at, it's an Athlon II x4. 2 extra cores, and nowadays most applications/games WILL take advantage of that. And the Core2Duo are STILL more expensive. Does that make sense to you? Re: Intel Dog **** Bag.
Not to mention AM3 motherboards are relatively new. Those LGA 775 boards are dead. The technology is dead. If you buy those, in 1 year you'd be in the same situation. If you buy AM3 you'll have room to move up to a nice Phenom II x6 6-core, or maybe even (probably) whatever AMD pulls out next. Not to mention better DDR3 support, and just newer technology all around.
Now that I ****ed off a few people, and likely made you feel like I'm a complete jerk.(It's the truth what I say)
If you spent your max budget which you said was $400 then I would suggest:
The chipset on this motherboard is brand new (~1 month old).
The processor easily overclocks to 3.7ghz on air and I personally got my Phenom II up to 4ghz on air.(check the Super Pi Top List in AMD section. I'm #5 I think? or something?).
This processor has L3 cache, and will perform slightly better but very close to Core2Quad at the same speeds. AND it costs 25%~ less! All because of blind loyalty to Intel, and their dominance of the market.
Total for the combo $269.98. This leaves you room for some memory (more memory and faster memory)
This is excellent memory, and is going to FAR outperform any kind of DDR2 you could have ever bought. Re: EDIT
Logically this is the best option in my opinion.
Grand Total: $404.19 (That includes a shipping estimate by the way)
Technically this is $4 over your max budget, so if you get this ram instead, you'll save $15 or $20 and it should perform comparably. They are both good sets of memory.
Grand Total: (with OCZ Special Ops instead of G.Skill. Ripjaws.) $387.80.
That motherboard is a nice one by the way, and so are both sets of ram. I'd personally go for the Ripjaws but if you're strictly $400 and under the OCZ Special Ops ram will do you fine.
Better performance vs price than a similar Intel rig. Better future-proofing.
Brand new technology in terms of the chipset.
Very overclockable processor.
Excellent overclockable ram with nice timings and low voltage requirement.
It speaks for itself.
EDIT: ASUS D945PVS??? The only thing I found with D945PVS was an old entry-level Intel motherboard.
Also, it only supports DDR2. You said you have DDR3. How exactly does that work?