Save the money you would be paying cyberpower to build it, Troll on here for a bit, source the parts you want (you'll have more budget to play with on account of not paying someone else to do it) take a deep breath, and build it yourself, I built myself a reasonable WoW machine a month or two back, I'd never built a pc b4 in my life and now I have, and I'm very glad I did.
http://www.tomshardware.co.uk/forum/forum2.php?config=tomshardwareuk.inc&cat=13&post=279226&page=1&p=1&sondage=0&owntopic=1&trash=0&trash_post=0&print=0&numreponse=0"e_only=0&new=0&nojs=0
thats my effort, and I seriously recommend you do a similar thing, the satisfaction alone from building it yourself is a great feeling, so quick shortlist for you.
1. figure out your budget and allow £50/$50 headroom,
2. find a semi-decent Motherboard/cpu combo
http://www.newegg.com/Product/ComboBundleDetails.aspx?ItemList=Combo.361143 found for 135 dollars ish, reasonable am2+ board, Black edit processor and some free ram to kickstart the build.
3. do the same for a case and psu, or rescue old stuff you already have, not with the psu tho, I'd recommend a new one of those.
Graphics ofc, its up to you what you spend, but I'd do some research and get the best you can afford if its for WoW.
you can always put more ram in as you go along, but 2gb will at least get you running for now
you seem set on an ssd drive? no exp myself but I'd partition the drive and have WoW on a seperate partition, allow 50Gb cause Cataclysms not far away now
and ofc whatever Os you are planning on using,you can use a 32bit system fine but it wont hurt to go for a 64bit if you can afford it, plus a 64bit will be able to use any extra ram you buy, 32bit only sees 3.2 ish gb. hope this helps man, like I say new myself so if nothing else take heart it can be done yourself and have fun