Heres a thermaltake for $25
http://www.newegg.com/Product/Product.asp?Item=N82E16817153023
The total wattage is not the only thing to look at, by the way. But this unit is 430 watts.
On this page you will find the thermaltake as noted above, plus another one for $38.99.
http://www.newegg.com/Product/Product.asp?Item=N82E16817153023
on the same page you find a coolermaster for $33.99
page 2 gives your a fortron for $36.99 and a sparkle for $29.99
http://www.newegg.com/Product/ProductList.asp?Page=2&N=2010320058+4025&Submit=ENE&SubCategory=58
I did this quickly so you have to check the wattage. But i can tell you that the Enermax i have is 330 watts and i run a p4 2.4, 2 ide h drives, a dvd, dvd burner, about 8 usb external drives and i have had them all up and running at one time, a 32 mb ati vid card, 3 fans, one large fan, on and on.
So you dont need so much wattage as you do brand name in a power supply, in my opinion.