With $2501, ya can smoke that original build and give yaself the coolest looking PC on the block....
I'm even including monitor, KB, SSD and OS and prolly other stuff ya don't need but you did say $2500 ..... knock off what ya don't need
Case - $ 270 - Thermaltake Level 10 GT Snow
http://www.newegg.com/Product/Product.aspx?Item=N82E16811133192
Best reviewed case I have ever seen. Do ya need white (extra $60 ?) ... do you need a $270 case, no of course not, but ya got the budget, so why not have a conversation piece on top of the load of unique great features it has.
Case Fan - $ 12 - Thermaltake Blue120 mm
http://www.newegg.com/Product/Product.aspx?Item=N82E16835106149
PSU - $ 150 - Corsair HX850
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139011
10.0 jonnyguru perofrmance rating, what else need be said ?
MoBo - $ 210 - ASUS P8Z68-V PRO/GEN3
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131790
I don't think ya need Z68 but it is the latest and greatest
CPU - $ 210 - Intel Core i7-2500K
http://www.newegg.com/Product/Product.aspx?Item=N82E16819115070
If a gaming box, no need for the 2600k.....
Cooler - $ 83 - Thermalright Silver Arrow
http://www.frozencpu.com/products/11676/cpu-tri-77/Thermalright_Silver_Arrow_Dual_160mm_x_140mm_Fan_Universal_CPU_Cooler_Sockets_775_1156_1366_AM2_AM2_AM3.html
http://benchmarkreviews.com/index.php?option=com_content&task=view&id=674&Itemid=62&limit=1&limitstart=4
TIM - $ 5 - Shin Etsu
http://www.newegg.com/Product/Product.aspx?Item=N82E16835150080
Nuthin tops its performance
http://benchmarkreviews.com/index.php?option=com_content&task=view&id=150&Itemid=62&limit=1&limitstart=12
RAM - $ 49 - (2 x 4GB) Corsair Vengeance DDR3-1600 (White)
http://www.newegg.com/Product/Product.aspx?Item=N82E16820233199
Its low profile, it's perty
GFX - $ 230 - Asus GTX 560 900Mhz
http://www.newegg.com/Product/Product.aspx?Item=N82E16814121425
GFX - $ 230 - Asus GTX 560 900Mhz Same
-40% more fps than a single 580that costs $40 more
-adding a 2nd 580 gets ya just 10% more fps than these cards
-OC capability as high as 30% over reference
-Great cooler and 7 phase VRM
http://www.pureoverclock.com/review.php?id=1201&page=17
HD - $ 110 - Spinpoint F3 1TB
http://www.newegg.com/Product/Product.aspx?Item=N82E16822152185
This the WD Black or Seagate 7200.12
However, if ya drop the monitor or anything else, take a hard look at the Barracuda XT....boots to Win 7 -64 in 21.2 seconds (vertex 3 max IOPS does 15.6). Watvh out though olde rones have 5 year warranty, newer ones 2 yes....get the 5 year, its also faster
http://benchmarkreviews.com/index.php?option=com_content&task=view&id=708&Itemid=60&limit=1&limitstart=10
SSD - $ 209 - 120 GB Mushkin Chronos Deluxe
http://www.newegg.com/Product/Product.aspx?Item=N82E16820226225
Uses premium 3Xnm Toshiba Toggle Mode Flash Memory .... only the Patriot Wildfire, OWC Mercury Extreme Pro 6G (latest revision) and OCZ Vertex 3 Max IOPS also use it .... makes Tier 3 performance in THG scale (highest of any 120 GB model)
http://www.tomshardware.com/reviews/buy-ssd-recommendation-value,3088-6.html
DVD Writer - $ 58 - Asus Model BC-12B1ST/BLK/B/AS
http://www.newegg.com/Product/Product.aspx?Item=N82E16827135247
Great unit, plays Blue Ray
Card Reader - $ 50 - AeroCool FP-01 55
http://www.newegg.com/Product/Product.aspx?Item=N82E16820314001
Hey, ya had room for goodies
Monitor - $ 290 - ASUS VG236HE Black 23" 120 Hz Monitor
http://www.newegg.com/Product/Product.aspx?Item=N82E16824236104
120 Mhz model is beautiful, also does 3D....add one of these someday
http://www.newegg.com/Product/Product.aspx?Item=N82E16814998061
Keyboard - $ 95 - Logitech G510
http://www.newegg.com/Product/Product.aspx?Item=N82E16823126100
Mouse - $ 60 - Logitech G500
http://www.newegg.com/Product/Product.aspx?Item=N82E16826104318
Not was expensive as Logi's top of the line but more than suitable.
OS - $ 140 - Win 7-64 Home Professional
http://www.newegg.com/Product/Product.aspx?Item=N82E16832116992
Again there's stuff in there ya definitely don't need and there is room for twin 580's with that stuff cut out, but for 10% extra fps....I just don't see the ROI (return on investment).