Quieter replacement for CX430 in a HTPC

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Hi there,
I have recently made the following build and I've found the CX430 fan to be really annoying.
It spins up for no apparent reason and is far too loud for a HTPC.

I don't want to make the same mistake again in getting a replacement.

Am looking at a SeaSonic SSR-360GP (since I read that most Seasonics are very quiet and very good quality), or a Silverstone SST-ST30SF Strider 300W SFX (again, because I hear it's very quiet).
Slight concern that the smaller fan in th SFX would be noisey, but maybe that would be offset by being "semi-fanless".

Note in this case I am constrained to 140mm for PSU length which rules out quite a few.

Would be gateful for any pointers. Cheers!

PCPartPicker part list: http://uk.pcpartpicker.com/p/LVK8xr
Price breakdown by merchant: http://uk.pcpartpicker.com/p/LVK8xr/by_merchant/

CPU: Intel Core i3-4130T 2.9GHz Dual-Core Processor (£0.00)
Motherboard: ASRock H81M-HDS Micro ATX LGA1150 Motherboard (£0.00)
Memory: Kingston Fury Series 4GB (1 x 4GB) DDR3-1600 Memory (£0.00)
Storage: Western Digital Caviar Green 1TB 3.5" 5400RPM Internal Hard Drive (£0.00)
Power Supply: Corsair Builder 430W 80+ Bronze Certified ATX Power Supply (£0.00)
Other: Silverstone Milo ML04

 

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Just for the record, I replaced the CX430 with a Seasonic PSU G-360 and it's been *way* quieter. Very happy now.