Just for a finger practice I compiled this set, likely to run AH quite well with decent eye candy. $10 can be cut out here and there by choosing an Intel reference cooler or slower memory, or even a lesser quality PSU, each of which would be saving pennies in a wrong place. On the other hand it also has some upgrading potential, getting a better processor might give a boost when the budget allows. Also, I calculated a case although in this case the case will come from a generous donator.  

PCPartPicker part list: 
http://pcpartpicker.com/p/DxzY23Price breakdown by merchant: 
http://pcpartpicker.com/p/DxzY23/by_merchant/CPU: Intel Core i3-4370 3.8GHz Dual-Core Processor  ($159.98 @ NCIX US) 
CPU Cooler: Cooler Master Hyper 212 Plus 76.8 CFM Sleeve Bearing CPU Cooler  ($19.99 @ Newegg) 
Motherboard: MSI Z97 PC MATE ATX LGA1150 Motherboard  ($89.99 @ Micro Center) 
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-2133 Memory  ($82.99 @ Newegg) 
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive  ($53.98 @ OutletPC) 
Video Card: Gigabyte Radeon R7 260X 1GB Video Card  ($99.99 @ Newegg) 
Case: Raidmax Atlas ATX-295WB ATX Mid Tower Case  ($29.99 @ Newegg) 
Power Supply: SeaSonic S12II 620W 80+ Bronze Certified ATX Power Supply  ($68.98 @ Newegg) 
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer  ($14.99 @ Amazon) 
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit)  ($89.98 @ OutletPC) 
Total: $710.86Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-10-06 11:35 EDT-0400