Everything looks pretty good for a rendering machine although depending what program you use (or how many you have open) you may want to upgrade to 16gb of ram - if not now at least in the near future. As for the psu, I think there are better quality power supplies out there. Here's a list of better psu's, I'd try to find one within my budget from tier1, tier 2a or tier 2.
http://www.tomshardware.com/forum/id-1804779/power-supply-unit-tier-list.html
I've personally had really good luck with seasonic (xfx and most antec's hcg series up to around 620-650w I believe are seasonic built). There are quite a few choices in those quality tiers and there should be something budget friendly. Typically the better psu's offer closer to their rated power (other lower end units tend to fudge the numbers a bit or have issues at closer to max load), they have cleaner more stable power (less noise/ripple in the power delivery) and last longer.
When you said 4x2 on the ram, not sure if you meant 4 sticks at 2gb each or 4gb x 2 sticks. Hopefully you meant 2 4gb sticks since you'll likely want to upgrade. Try the 8 to start with and see how it does for you (watch your resource monitor on win task manager). If you're constantly at 7-7.5gb out of 8, or if using adobe software (or others where you preset how much system memory to use) that could be falsely limiting performance. For instance in adobe, I can set photoshop or illustrator to dedicate a percentage of ram to it. If I set it at 40%, it would only use around 4-5gb (including os ram requirements) and appear as though 8gb is enough. However if I leave the setting the same (40% usage) with 16gb ram it will use much more especially while loading presets and other things and will perform much better.