[Princess Garnet]

Slow slow slow slow slow ram. Iirc the CPU bus is 1333mhz, and you're buying ram that's 667mhz.. That's half the speed, your CPU is constantly going to be waiting on the ram. Ideally you'd want 1333mhz ram but you can't get DDR2 in that flavour so you're best off getting PC8500 (1066mhz) and if you're really adventurous overclock it.

Ungh, you do realize 667MHz RAM is what's 1:1 with a 1333MHz CPU, right? The FSB is quad pumped, so 1333MHz divided by 4 is 333. The RAM is double data rate, so 667MHz (it's really 666MHz, but I think Intel is afraid of that number) divided by 2 is 333MHz. Even though the FSB is effectively twice as fast, it's really 1:1, and it is 667MHz RAM that officially goes with and matches a 1333MHz FSB.

The RAM is fine. However, it is true that if this is for PCSX2, you're definitely going to want to overclock, and thus get RAM that can do more than just keep up. Most decent 667MHz RAM (non-Value or generic stuff) will go to 800MHz, sometimes higher, but the price difference is so small, that I'd get at least 800MHz RAM. Most 800MHz RAM goes to 900MHz, if not more, and unless you're shooting for the stars, you probably won't go over 950MHz at absolute most, if even 900MHz.

Here's what I have.

Newegg.com - CORSAIR 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory - Desktop Memory

I'm sure there's better, and the timings aren't the greatest (it really does 5-5-5-12, as my label says, at 1.9V, the 5-5-5-18 is for 1.8V standard), but it goes up to about 960MHz (your mileage may vary), and unless you're going to run it faster than 1:1 (absolutely no reason to for PCSX2), it won't hold an overclock back. If you find better though for cheaper, go for it.

As for your extra questions, just get a good aftermarket CPU air cooler and a decent PSU. Here's two recommendations for each.

PSU:

Newegg.com - Computer Hardware,Power Supplies,Power Supplies,PC Power & Cooling,
Newegg.com - Computer Hardware,Power Supplies,Power Supplies,Corsair Memory, Inc.,.

You'll notice I just linked to the PC Power & Cooling and Corsair sections, and not any specific PSUs. Any of them should work well (the 400W CX from Corsair, and the 370W and 420W models from PC Power & Cooling may be cutting it close though).

CPU Coolers:
Newegg.com - XIGMATEK HDT-S1283 120mm Rifle CPU Cooler - CPU Fans & Heatsinks
Newegg.com - ARCTIC COOLING Freezer 7 Pro 92mm CPU Cooler - CPU Fans & Heatsinks

P.S. The second is hard to recommend at that price, since other good coolers came down in price. It's an okay budget cooler, but I got mine for ~$20, and it was worth about $25 at most, like they used to have it.

The first is what I use (and I went from the second to the first), but I use an additional retention bracket (it uses push pins otherwise, like the second).

 

[Princess Garnet]

That should all work well. Just note that the stock CPU cooler isn't ideal for overclocking, which PCSX2 really benefits from, although it would work fine at stock or for mild overclocks. It just may run on the warm side (especially with summer coming up, and considering your location).

 

[Princess Garnet]

If you put a cheap aftermarket cooler with it, like either of the two I recommended, and optionally (also recommended) put $5 into a tube of Arctic Silver 5 and use that along with it, you should almost be certain to be good to go for 4GHz or more. Those components, unless you get a real lemon with any of them, will very likely do at least that much, and that's the ideal setup (not necessarily the best ever) for PCSX2 really.

If not, the stock cooler should still be okay for about 3.6GHz or so? Some have shown off videos of E8x00s using the stock cooler at 4.0GHz for the sake of it, but I wouldn't recommend it for actual or long term use.

 

[Princess Garnet]

Two should be fine (one front and one back, not counting the PSU's fan). That's all I had in the mATX case my Pentium Dual-core E2160 @3.0GHz was in, and the temperatures were fine with a stock cooler with the stock thermal grease. The two fans weren't even high RPM fans either. They were just the basic Cooler Master fan that sounds almost silent. The case did have two openings on the side though (one near the CPU for a duct that wasn't included, and another below for the GPU), but neither had fans.