Need CPU advice please :(

Both are nice, and both would work well for your needs. If you don't upgrade your computer a lot, then I think I would go for the X4 620. True, the Phenom II does have 6mb L3 cache, and has the possibility of being unlocked into a full on quad, but the 620 is a guaranteed quad core, and will still game well enough in WOW despites its lack of L3 cache

Way to pick option C  

Definitely go quad core. More and more new applications are taking advantage of it-- and you dont really need the clock speed for WoW.

The Athlon II X4 630 is only $12 more...($99 vs $112) I would probably choose it over the 620 because of the higher clock speed if you arent into overclocking.

Although the very sexy OEM Phenom II X3 Black is available for $109...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

depends on which socket u have......if u have

AM2--get an AMD Phenom II X4 945 BE
AM3--get an AMD Phenom II X4 955 BE