I've got very similar specs to you and went through a similar exercise about a month ago.
Lemme find the results and post here for ya.
OK, found the thread
Read all the gory details here:
http://www.carigamers.com/cms/forums/index.php/topic,21117.0.htmlMy budget was about TT$3000.00 though
And the first proposed specs were as follows:
CPU: Intel Core i5-2500K Sandy Bridge 3.3GHz LGA 1155 95W Quad-Core($224.99)
MOB: GIGABYTE GA-P67A-D3-B3 LGA 1155 Intel P67 SATA ATX Motherboard (US$114.99)
RAM: G.SKILL Ripjaws X Series 8GB (2 x 4GB) 240-Pin DDR3 1600 (PC3 12800) 3-12800CL9D-8GBXL (US$99.99)
GPU: ATI 4870 1GB (well in your case, it will be 4850)
Ram is really cheap now, so no big deal dropping in the DDR3. You could sell the old DDR2 easily enough on the trading grounds.