Debating CPU Upgrade

[Atrail]

My Rig

I was going to order the XP1700 for $52 at Newegg although some people are getting the A instead B chip.
You are guranteed a B here but you will $12 more.
Any advice on what would be the best, most cost efficient upgrade?
Thanks...

 

[calvink]

I got a 0302 1700B from Newegg, and i haven't heard too many ppl getting A's. So your probably safe.