First of all, with all the reviews out now on sandy bridge CPUs it is obvious that AMD CPUs should be non-existant on the leaderboard until bulldozer.
High level - stick with the i5-2500k which can be had right now at microcenter for $180. This saves roughly $100 that can be put toward GPU and the performance in gaming between the i5-2500k and i7-2600k is minimal.
My opinion would be to ditch the GTX 570 @ $334 and go with 2x AMD 6950 1GB Crossfire for 2x$225=$450 on newegg ...about $100 more that you saved from the CPU.
Mid Range - bye-bye 6core amd, hello i5-2400 @ $150 (micro center). Bye-bye MSI 890FXA-G70, hello MSI P67A-C43-B3 @ $125 (Micro center). You can go H67 in this build because the i5-2400 is not OCable. You save $125 between the motherboard and CPU, which will DESTROY a 1060T. Now with the extra $125 spend it on 1x AMD 6950 @ $225 on newegg ($45 more than GTX 460) for total savings of $80 and a much much faster gaming computer .
Low Range - The i3-2100 has proved to be faster than the i5-6xx series already (see http://www.silentpcreview.com/article1179-page6.html) and if you compare on the cpubenchmark chart you can see the i3-2100 scores 3900pts vs 3400 for the Athlon 640, i didnt see the 645 on the chart. Reference (http://www.cpubenchmark.net/cpu_look...0+%40+3.20GHz).
With this in mind i would go with the i3-2100 @ $99.99 (micro center) and grab an MSI H67MA-E35 for $85 on newegg to save $11 net. Remember, H67 will be fine for this build because you cannot overclock any 1155 CPUs other than 2500k and 2600k (you can only OC w/ p67 FYI for anyone just getting sandy bridge info).
Some may disagree with this next part, but if this was my computer on the low end i would buy a cheaper PSU, smaller HDD, and cheaper RAM in favor of a better video card.
I would go with an Antec earthwatts 380w $39.99 newegg, Patriot 1333 4Gb (2x2GB) for $39.99 newegg, and Western Digital Caviar Blue WD5000AAKS 500GB Sata Hard Drive for $39.99 newegg, for a net savings of $52. $52 savings here + $11 savings above for total of $63. Currently spending $75 on a 5760, so $75+$63=$138. I'd go with a Sapphire 5770 1GB for $119.99 and pocket the extra $18 or use that somewhere else as seen fit. Remember the Antec earthwatts is only 380w and 1x PCIe power plug, but the 5770 only needs 1 PCIe and the i3-2100 barely uses any power.
Summaries of Final Builds:
MSI P67A-GD65 $180
2x HIS H695FN1G2M HD 6950 1GB $450
CORSAIR XMS 8GB (2 x 4GB) DDR3 1600 $90
OCZ Vertex 2 OCZSSD3-2VTX120G 3.5" 120GB $210
Asus Xonar DX Sound Card $80
Corsair TX950 $150
MSI P67A-C43-B3 $125
HIS H695FN1G2M HD 6950 1GB $225
CORSAIR XMS3 4GB 1600 CMX4GX3M2A1600C9 $45
Seagate Barracuda 7200.11 ST31500341AS $70
ASUS Xonar DX 7.1 $90 (**Why is midrange sound more??)
Corsair TX CMPSU-650TX $90
MSI H67MA-E35 $85
SAPPHIRE 100283-3L HD5770 1GB $120
Patriot 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1333 $40
Western Digital Caviar Blue WD5000AAKS 500GB Hard Drive $40
Antec EarthWatts Green EA-380D Green 380W $40
Let me know what you guys think.