Pentium D 945 @ 3.4ghz VS Celeron E1400 @ 2ghz

Hi folks, I want to build a secondary computer for when I have guests around.

This computer is going to be the cheapest of the cheap, and I'm going with used parts. All it needs to do is play modern games without exploding.

Here's I got so far:

XFX 8600GT - got it for 32$

2GB Transcend DDR2 800 - 16$

Generic PSU 450W - 22$ (Don't really care about PSU on this build)

80GB HD IDE - 17$

Now the motherboard is what I'll buy brand-new for this build:

Thinking of going with this: http://usa.asus.com/products.aspx? [...] odelmenu=1 - This goes for 50$ brand new, and according to the website it supports the entire LGA 775 cPU line-up. Including P4s and Pentium Ds.

Ok, now to my question:

For the CPU, I have the choice of going with a used Pentium D 945 @ 3.4ghz, for 35$.
OR, going with a brand new Celeron E1400 @ 2ghz for 50$

I know that generally, Core 2 architecture kicks major netburst ass.

But since the cheap mobo I showed you above probably won't OC that well, would it be better to go with the significantly higher clocked Pentium D instead of the Celeron? It also has a much larger cache (2MB per core vs 512kb per core, on the Celeron).

Cheers!

PS: I know that there would be no comparison between a Pentium D and a higher-end Core 2 CPU, but since the choice is only between these 2 CPUs, I'm left wondering if the Pentium D's higher clock has the advantage over the Core 2 tech in this case.

The e1400 will stomp it. No question.

i run my pd940 on 4.1ghz for the past 3 years and no problem

If you could overclock the e1400, it would destroy the Pentium D.

Does his motherboard choice have nice O/C capabilities?