My existing computer is just not up to the demands of Tradestation. It freezes up whenever the market gets active. It is a $300 Dell box with 256K RAM that I added 1GIG crucial memory and upgraded the video card to handle 2 monitors. I want to get a new computer that will only be used for trading (Tradestation). I will use the old computer for everything else, ie internet, spreadsheets, word processing. What do I need? Cost is a very high priority. I have had good luck with Dell. They have a Vostro line that I can buy with: IntelÂ® Coreâ¢2 Duo Proc E6550 (2.33GHz,4MB L2Cache,1333FSB) Problem is, I don't know what all that crap means. versus, say: IntelÂ® Coreâ¢2 Duo Proc E6750 (2.66GHz,4MB L2Cache,1333FSB) [add $100] Looks like you pay $100 to get a slightly faster clock speed processor. Shouldn't make a noticeable difference, should it? Operating system? My gut says, stay away fron Vista. Probably select XP Pro. Here is a sticky part: 2GB Dual Channel DDR2 SDRAM 800MHz - 2DIMMs [Included in Price] 4GB Dual Channel DDR2 SDRAM 800MHz - 4DIMMs [add $300] I think I probably need 4GB RAM, but $300 extra??? I will probably use my 2 existing monitors with the new computer, and get a new monitor with the new computer to use with the old box. I would like to keep it under $1000 but that seems not likely if I upgrade RAM to 4GB. Thoughts? And I need an economy box that works, not bells and whistles and latest biggest best (expensive) thing out there. Thanks!