Everybody is on a budget but this isn't reason to cheap out on the most important component inside the PC since low quality units have the power to fry ALL they are connected to when they go sky high.
As far as build quality goes;
Thermaltake Smart series is low quality (Tier Four),
Enermax naXn series is mediocre quality (Tier Three),
Seasonic M12II EVO series is good quality (Tier Two),
PSU Tier list:
http://www.tomshardware.co.uk/forum/id-2547993/psu-tier-list.html
For proper PSU, aim for great quality (Tier One) or good quality (Tier Two) unit.