My suggestion is pretty simple. I think having a pricing calculator on signup that asks:
– Processor size
– Ram size
– Transfer size

Just sliders on signup so I can customise each one of the above independently. You "can" restrict downsizing on certain items for control and ease...

I find that having to mount space myself or having to opt (and pay) for a high transfer when I upgrade is unnecessary. What if I just want plenty of storage and high memory but 1TB transfer?

If this one passes... you will have put the icing on the cake.