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				Pentium II 450 as world/zone server  
Pentium III 1.2G as MySQL Server
			
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 I would switch this up - put the zone servers up on the p3 and the world/mysql server up on the p2.  15 zone servers ought to handle 7-12 people well enough.  As long as you're not on a slow connection, your setup should work well for you.  I was amazed at how well a weak computer handled the processing load.
Any guesses I could make on bandwidth versus cpu requirements would be based on 0.4.4.  I don't know about 0.5.0.  However, based on improvements in the client processing loop, we may have cut down significantly on bandwidth requirements in 0.5.0.  OP_ClientUpdate is now sent 
much less frequently.