Hi there. Limited funds, so I can't yet simply get the best CPU and the best GPU. My current choice is down to these 2 combinations: 1) i7 4-core(8thread) 3.4Ghz 8MB L3, using the integrated HD 4000 2) 1) i5 4-core(4thread) 3.4Ghz 6MB L3, and a GeForce GTS 450 (GTS 450 is about 100-200% more powerful than the HD 4000) for 2 monitors (1280x1024), each showing 4 charts. MB Desktop Pro software. Rest of system: 8GB @ 1600 Windows 7 H.P. 64-bit 7200rpm HDD 430w PSU (high quality) (GTS 450 uses 250watts at full load) (both CPUs are 77watts) In time I can easily upgrade the CPU (if starting with the i5), HDD, the PSU, and add any graphics card.