Ok, I suggest you shop at Tigerdirect (personal preference)
I find its cheap there.
But anyway
The PC there looks good
Core i5 Quad 2.8Ghz is good, will run latest games
4GB DDR3RAM is good too, maybe upgrade to 6GB, budget depending.
1TBHDD what more to say its 1TB
the 460GTX wil run Arma2 perfectly, as the reccommended card for maxed is iirc the 260GTX or 5770(ATI)
PSU 700W is perfect, good for the newer Nvidia and ATI cards(iirc they require 500-600W)
But back to Tigerdirect.com
I assume your spending limit is between 800-900 dollars?
I found this PC for 750$ without shipping ofc
PC here
It has a little less Processor speed( 2.6) but it does come with AMD's latest socket type(AM3) and has a fan that will work...so you can buy a better AM3 socket type processor(PhenomII, AthlonII etc) without the fan saving a good 50-60 bucks
Still has 4GB DDR3 RAM, but it can be upgraded to 16GB
Lots of room in the case, looks cool, has multiple USB ports(

Radeon HD 5770....can run arma2 maxed, so bonus there
Only 500GB HDD, but hey HDD are cheap nowadays
You have media readers, for cameras and the such,
Overall a cheap PC, for basically the same as the one you wanted from newegg
I'll link you to some others that are good PC's
6Core 2.8Ghz(
iBUYPOWER Gamer Extreme 572SLC Gaming PC - AMD Phenom II X6 1055T 2.8GHz, 4GB DDR3, 1TB HDD, DVDRW, ATI Radeon HD 5770 1GB VRAM, Windows 7 Home Premium 64-bit, Blue at TigerDirect.com
AMD quad core (
SYX BlackOps PC ? AMD Athlon II X4 630 2.8GHz, Genuine Windows? 7 Home Premium 64-bit, 4GB DDR3 1333MHz, 500GB 7200RPM HDD, DVDRW, 1GB AMD Radeon HD 6850, 500W PSU, FREE COD: Black Ops PC Version at TigerDirect.com
And here is the search page....AMD's are cheaper btw
AMD Gaming Computer, AMD Gaming PC, AMD Video Game PC at TigerDirect.com