I went for the £99 option as you get the riser block and dvd . The dvd is totally useless but the riser block is worth having ( so I am told , not used it yet and hope to get out rather than using it )
The air ones are much noiser than the magnetic turbos. They are responsible for them originally being called turbos because they sound like a jet. I have been told the fluid turbos are even quieter but haven't used one - they are a bit pricey.
Enjoy your Elite - the worse the weather is outside the easier the turbo training gets.