Just blindly picking a Seasonic is not going to solve his every power supply problem. The proper way to pick a good component is to determine the specs you need and/or want, check reviews at multiple respected review sites to discover high quality options, corroborate that with user reviews, then rank the units yourself according to which you think it best, check actual prices for you to get that component to your door (including all costs), and get the one highest on your list that fits in the budget for that component.
Seasonic is not the best at every pricepoint. There are people on this BBS who will blindly tell you to get a Seasonic without even researching other alternatives that may be just as good or better, based on brand name alone. And that's no way to make decisions.
Here's is, IMO, the best power supply reviews on the planet:
http://hardocp.com/reviews/psu_power_suppliesFind a specific model they rate highly that fits your budget, check other review sites and see if they agree, and check user reviews if it passes the first two criteria. Don't worry about brand name, although Seasonic will likely be a contender, they are not the only one.
As for a $100 video card, you might check this article:
http://www.anandtech.com/show/7703/desktop-video-card-buyers-guide-january-2014 , (which recommends the AMD Radeon HD 7770).