barton 3000 and 1gb

Hi,
i have a dedicated with barton 3000 and 1gb memory, centos 3.3 and kernel ver 2.4. today it has high load on peak time, about 3-10 ( 1000 user online including search engine spider )
the question is how to reduce server load? should i add more memory or upgrade cpu?
if i need to upgrade, what cpu is better (from best to worst)? consider i have budget only about 150$

THanks

 

 

 

 

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