Here is the new G540 4 axis package (tested and suggested by Geckodriver inc): $524.95
1 pcs G540 4 axis Driver board
http://www.geckodrive.com/product.aspx?c=3&i=14469
4 pcs 270 oz-in stepper Motors KL23H276-28-4B (1/4" Dual Shaft with flat )
http://www.kelinginc.net/KL23H276-28-4B.pdf
1 pcs KL-350-48 48V/7.3A 110V/230V
http://www.kelinginc.net/SwitchingPowerSupply.html
http://www.kelinginc.net/CNCNEMA23Package.html