Psu under 100$

Corsair RM650x, Haswell ready, 80 Plus Gold, fully modular, Tier I or Tier II unit. On sale at Newegg right now for $99.99.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817139143&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-PCPartPicker,%20LLC-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=

ETA: Oh, it's also got a $20 rebate after the discount, if you care about that sort of thing.
 
For the price, there's really no need to look beyond either of these:

PCPartPicker part list / Price breakdown by merchant

Power Supply: SeaSonic S12II 620W 80+ Bronze Certified ATX Power Supply ($63.99 @ SuperBiiz)
Total: $63.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-06-10 14:39 EDT-0400

PCPartPicker part list / Price breakdown by merchant

Power Supply: EVGA 750W 80+ Bronze Certified Semi-Modular ATX Power Supply ($48.99 @ NCIX US)
Total: $48.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-06-10 14:40 EDT-0400

Bronze efficiency is fine - provided the PSU has quality components. Both of these options do.
 

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