Welcome to boxing!
Warcraft is a great game to box.
Windows 7 will support a lot of ram.
As JohnGabriel mentioned, you'll likely need more than 4GB if you want to four/five box.
I'd recommend 8GB for boxing; I have that, and with a lot of addons and other processes running, my system is fine.
I was using an i5 2500K, and that was definitely adequate for 5-boxing.
But when I started to stream, I noticed it was a little choppy.
Not sure where an i5-2300 sits in comparison.
Warcraft is a lot more CPU dependent than graphics related.
Not sure how strong of a card an HD 5700 is.
I've boxed warcraft in Cataclysm on a GTX 275, 1GB card.
When the card died, I upgraded to a GTX 570, which gives a bit more eye-candy.
Spell effects, Weather, Water, Shadows... are more graphic dependent, most other things are more CPU dependent especially view distance.
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