Motherboard and Memory Question...

I have the following PC:
CPU: Intel Dual-core E2180. (At stock with stock cooler)
RAM: 2GB DDR2 667 (Kingston)
PSU: Generic 450watt
MOBO: Intel D945GCNL
GPU: PNY 8600GT DDR3 512MB.

Now, I am kinda upgrading My Mobo. Because my current one does not work properly anymore. Now where I live there is not much Variety in Motherboards, and they are quite expensive compared to the Global Markets. So, here are the Motherboard which suite my budget and are easily available in my Country. (Remember, we don't have major brands like Gigabyte, MSI, Foxconn, etc.)

Now since I have really regretted getting a Intel Mobo, simply because they cant OC ones processor, and I happen to have a CPU which can OC well at stock. Now I wont keep intel as an option. And since I dont know really anything about motherboard or Overclocking, you Guys will need to tell me which Mobo I can get for fulfilling this purpose.

Here are my choices: (And these are the only ones really)

Asus: P5QPL-AM
XFX: 630i (I really like this one, and I am getting a good deal on it)

Very Limited, I know. But I *Might* be able to get this one also:
Asus: P5QL-CM (The MOST expensive of the lot, and not easily available, and its a bit out of my budget)

Now, which one suites my need the best. I think XFX 630i...but the probelm is that, it does not support 667MHz Rams..right?
http://www.xfxforce.com/en-us/prod [...] 630.aspx#2

Its says:

So the main question for this Mobo is: Will the XFX mobo run and OC well (Lets say..2.6..OR 2.8) with my current pair of 1GB * 1GB 667MHz Rams? Or will I need to spend cash on one stick of 2GB Ram 800MHz

Thank you. And I really DONT want to upgrade my Rams...

So the 667 should work right out of the box? Cool, thanks. And what do you mean by:
Memory Speed 400MHz (2 X FSB) ? Thanks, though.

Ah, Now I get it. Thanks, I really appreciate it.

Thanks for pointing that out dextermat! But the thing is..800Mhz Ram is pretty expensive where I live if compared to US/UK etc.

Ok..I have another option now too:

P5KPL-CM. But I heard this Mobo requires good ram (800-1066) FOR a decent Overclock. Because the Ram Dividers are locked. So I should go for a unlocked ram thing Mobo?

So let me lay down my options:

Asus: P5QPL-AM
Asus: P5QPL-CM
Asus: P5KPL-CM
XFX: 630i. (If what dex said is true..then I wont prefer this board)

Now I want to know two things:
First: Which will give me the best OC without Upgrading and OC'ing my current Rams?

Second: I need as much info anyone of you guys can provide about all the mobos listed. (Just in case, my local shop is out of one and I need to decide an alternative one)

Third: Which motherboard has unlocked ram thing?