Get an AXP 2700+, it cost only ~$100. There performance difference between 2700+ and 3000+ is ignorable, since they're equally clocked (3000+ has 512kb L2 cache, compared to 2700+'s 256kb, but it helps very little).
For $100-$110, AXP 2700+ is a good upgrade from AXP 1800+
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