Under 100 dollars you won't get a good quality PSU. One of the best companies are Corsair, Antec, Cooler master, etc...
We just linked 2 PSU's made by seasonic for under $100...
Yeah I don't mind MIR, those both look like good options.
Would you recommend it over the 750 watt corsair psu which is $100 after rebate. Is it worth getting the xfx psu over the corsair because it has 2 6+2 pins? I don't know of any cards that require the extra 2 pins.
Corsair PSU is less efficient, not modular, and is made by CWT, not Seasonic. Seasonic is without a doubt the best PSU maker in the world. Plus that corsair is based on a platform thats about 5 years old now.