well they both dont sound very good but a link to the 2 psu's would help!
i can find info on the HEC 550watt but none for the ULTRA
the HEC has 2x12v rails with combined amps of 35, will power a half decent gpu!
I would trust an Ultra more than a HEC unit, however both are generally about as low end as you can get. This is the cheapest psu i would think about purchasing:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817189005
Ultra is somewhat of a house brand of tigerdirect, some units are relatively decent(better quality than rosewill, lower quality than xclio/ocz/corsair/etc).i wouldnt trust any of the psu he suggested... hec or ultra, sound like cheapo junk man!
hope your not hooking them up to a good pc, if the psu blows it could take some componants with it!
i always go with reputable brands
Ultra is somewhat of a house brand of tigerdirect, some units are relatively decent(better quality than rosewill, lower quality than xclio/ocz/corsair/etc).
Well it depends where are you buying these? If the first link of $70 is true there are better options for you.
http://www.newegg.com/Product/Produ...005&cm_re=650w_corsair-_-17-139-005-_-Product
Is a good example after rebate its almost twice the amps and 1 rail and can power most GPU out currently. Leaves more room for upgrades so later you wont have to pay another 60-70 for another PSU.
I would choose the HEC but in the end id not choose either for myself.