So thats 95Watts IF/WHEN you stress test the CPU, with some OC, bump it to 110-130Watts, account 20Watts for the mobo/RAM, 8Watts for each HDD/SDD, with 4 HDD's/SSD's you end up with a stress test consumption of 147Watts at stock and around 180Watts with some OC.
With a decent PSU with 450Watts that still leaves you 450-180 = 270Watts, enought juice for any GPU known to man..
Seasonic in Europe are the "cheapest" name brand decent PSU's 450Watts will cost you around 50€, if you want over 300Watts of headroom grab the 520Watts edition for 60-70€, just dont use crappy PSU that cant output half of their rated power before exploding or the rails saging 1v and then complain that your computer is unstable and BSOD's everytime you open word.