850w Tier 2 or 1000w Tier 3 PSU for a crossfire 290 system?

Armadillo2001

Reputable
Oct 12, 2015
74
0
4,660
Hi interweb,
I am considering crossfiring my r9 290 with another, but my evga 750g is not powerful enough. As I want to keep my budget low, I have decided on a PSU in either of these categories. I plan to overclock which is not recommended on a Tier 3 PSU, but since 1000w is more than I need I feel like the overkill power should make up for the rating.

Thanks in advance.
 

Armadillo2001

Reputable
Oct 12, 2015
74
0
4,660


Full system specs:
i5 4670K, hopefully overclocked a good bit
Some new Z87 or Z97 motherboard - my old one died and I haven't purchased one yet
16GB DDR3-1600
2x R9 290 (one is a windforce OC which I have, the other I will buy soon)
1TB 2.5" SSHD (seagate maybe?)
Currently an evga 750g

Budget: Hopefully no more than $120 for the PSU

Live in the US, I'm only interested in buying online though