Ok, I have two options for you. The first one will be just above your listed budget, the second, well under. Both builds have many of the same parts, chosen for both quality and value and ease of use/assembly. If you really need the computing power of the first option, but the budget constraints are inflexible, it will be possible to choose less expensive items to brin it under budget, but the individual part quality will likely suffer. Let me know if I can be of further assistance.
Case (15" high) $88.88
LIAN LI PC-A05NB Black Aluminum ATX Mid Tower Computer Case - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E16811112218Very high quality, very thoughtfully constructed with the end user in mind, highly rated.
Case Accessory USB and audio ports $14.99
SILVERSTONE SST-FP32-B Aluminum USB/1394/Audio Panel ( Black ) - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E16813999356Above case has USB and audio ports on top, you had a preference for front.
Video Card $79.99
XFX PVT96OZDFU GeForce 9600 GSO 1GB
http://www.newegg.com/Product/Product.aspx?Item=N82E16814150340Solid card, very budget oriented, can handle dual or large resolution monitors
PSU $109.99
CORSAIR CMPSU-520HX 520W
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139001Modular - helpful with the smaller case, highly reliable product, plenty of power.
Option One: $860 before MIR and shipping (price includes parts common to both builds)
This option has the new Nahalem chip with 4 cores PLUS 4 hyperthreaded (virtual) cores. For heavy/time consuming CPU oriented work this is the preferred processor.
CPU $279.99
Intel Core i7 920 Nehalem 2.66GHz
http://www.newegg.com/Product/Product.aspx?Item=N82E16819115202Motherboard $199.99
GIGABYTE GA-EX58-UD3R
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128375RAM $84.99
mushkin SP 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 1333
http://www.newegg.com/Product/Product.aspx?Item=N82E16820226063Option 2: $620 before shipping and MIR (price includes parts common to both builds)
Not as much processing power, but still very fast and a better value.
CPU $189.99
Intel Core 2 Quad Q8400 Yorkfield 2.66GHz
http://www.newegg.com/Product/Product.aspx?Item=N82E16819115057Motherboard $89.99
GIGABYTE GA-EP45-UD3L
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128372RAM $49.99
G.SKILL 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 1066
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231166