The Thermaltake toughpower GF1 650W 80+ gold fully modular PSU is currently $99 at Amazon AU save $70, the RRP is $169 but it can be found cheaper. This price seems like the cheapest current deal, cheapest Amazon price according to Camel.
The specs look good and its fully modular at under $100
P/N: PS-TPD-0650FNFAGA-1
watts: 650W
Model: PS-TPD-0650FNFAGx-1
Type: TTP-650AH3FCG
Max. Output Capacity: 650W
Peak Output Capacity: 780W
Color: Black
Dimension ( W / H / D ): 150mm(W) x 86mm(H) x 160mm(D)
PFC (Power Factor Correction): Active PFC
Power Good Signal:100-500 msec
Hold Up Time: > 16msec at 100% of full load
Input Current:10A
Input Frequency Range: 50Hz - 60Hz
Input Voltage:100V – 240V~
Operating Temperature: 0°C to + 50°C
Operating Humidity: 20% to 90%,non-condensing
Storage Temperature: -20°C to + 70°C
Storage Humidity: 5% to 95%, non-condensing
Cooling System:14cm hydraulic bearing fan
Efficiency: Meet 80 PLUS®Gold at 115Vac input.
MTBF: 120,000 hrs minimum
Safety Approval: CE/cTUVus/TÜV SÜD/FCC/BSMI/EAC
PCI-E 6+2pin: 4
Protection: OCP, OVP, UVP, OPP, SCP, OTP
Other Thermaltake deals on Amazon
Thermaltake Toughpower iRGB Plus 850W 80+ Gold Riing Duo Fully Modular Digital PSU $149
https://www.amazon.com.au/Thermaltake-Toughpower-Digital-Sup…
Thermaltake Toughpower Grand 750W 80+ Gold RGB Sync Edition Riing Fully Modular PSU $119
https://www.amazon.com.au/Thermaltake-Toughpower-Grand-750W-…
TT Premium X1 RGB Cherry MX Blue Switch Keyboard (probably worth its own deal) $83.85 (currently on sale for $99 at Mwave and Umart)
https://www.amazon.com.au/Premium-Cherry-Blue-Switch-Keyboar…
guess other sweetheart power supply is rm650x if you want japanese capacitors vs rm650 and this seems $40 cheaper than the corsair rm options.