You can get an OEM Pentium D 820 from eWiz.com for only 160.  Pair that with a decent aftermarket HSF and you're still cheaper than the 3700+.  If price is your main concern then I'd recommend that, as far as the processor is concerned anyway; however, if your budget is really tight then I'd go with the 3700.  With that you can find a nice 939 board that supports AGP (there aren't many) and you can keep your current card.  Only problem is that you're currently running a P4 1.8, so I'm guessing you're probably using DDR 333 at the most, but likely DDR 266, so you'd have to get better RAM if you go with the 3700.  If you want to build a nice little budget dual core system, go with the Pentium D 820, or maybe even a Pentium D 805 if you want to save a little extra dough.  You've been this long with a P4 1.8, so you'll still notice a monstrous increase in performance with either processor.  Only problem is that you'll have to get a PCI-E vid card, b/c AFAIK none of the Pentium D chipsets that support AGP are worth even glancing at.  As far as having to buy DDR2 ram, there is a bit of a premium over DDR 400, about $20 for comparable value ram, which, unless you plan on doing some serious overclocking, is what I'd recommend you get.
			
			 
				
		 
			 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		
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