Workstation PCs - Home Built

Well, MadAdmiral helped me with a great build a week ago for these PCs, but being that the company works slow, most of the daily deals are gone! (Arg!) They are ready to purchase finally, looking for 4 PCs to replace some older Win 2000 PCs. Specifically, the really awesome MoBo/Ram combo and the Case/PS combo are gone. ><

APPROXIMATE PURCHASE DATE: Today/Tomorrow BUDGET RANGE: 800ish ea. (US Dollars)

SYSTEM USAGE FROM MOST TO LEAST IMPORTANT: Specific Non-Graphics Intensive Business Software (An entire front end package, Accounting/Customer Orders, etc., but, it runs on Windows 2000 easily...), Office 2007, Web browsing, Dual Monitor Usage, Terminal Server Usage (Citrix XenApp)

PARTS NOT REQUIRED: Keyboard, Any Software except still need OS, Monitors, Mouse

PREFERRED WEBSITE(S) FOR PARTS: Newegg.com is my personal favorite, any is fine though. United States is Country of Origin.

PARTS PREFERENCES: Most of the PCs here are Intel parts, however, it's not that strong of a preference, anything works!

OVERCLOCKING: No SLI OR CROSSFIRE: No

MONITOR RESOLUTION: 1280x1024 x2

ADDITIONAL COMMENTS: Doesn't need to be too fancy but dual monitors are a must, and the 139.99 Win 7 Pro OS.

Thanks again for any help!