Thanks for sharing your list.
Some additional notes:
Which temperature sensors to use depends on your setup, I like the wall mounted ones myself as a beer sensor:
To make connections inside your fridge for them, you can consider the RJ12 coupler and some RJ12 cables:
I have added USB cables to the store:
SD card doesn't have to come pre-loaded with Noobs, you can do this yourself. But you do need to check that the SD card is compatible with the Pi here: http://elinux.org/RPi_SD_cards
I would go for ring connectors instead of fork for the SSRs, they're less likely to come loose.
RTC is optional, but good if your Internet connection and/or power is unreliable. If your power tends to have interruptions, consider a UPS for the pi: https://www.modmypi.com/raspberry-pi/breakout-boards/pi-modules/ups-pico
It can shut down the Pi correctly before the battery runs out so you don't risk SD card corruption.
If you want to hold the Spark to your fridge with magnets, get these: https://www.supermagnete.de/eng/pot-magnets-with-countersunk-borehole/countersunk-pot-magnet-diameter-16mm-neodymium-n38-nickel-plated_CSN-16
HDMI cable, keyboard and mouse are only needed for a one time setup if you don't have a network connection on the Pi yet. You can just temporarily use your TV and an keyboard you have laying around.