Don't get rid of the contax stuff... 😕 don't listen to these 'only leica and nothing else' fanatics!!!
The Aria is a camera you don't want to part with.
If you've got 2 rollei's, you could obviously get by with 1 of them. And sell the 90elmart if you don't use it, you'd probably vote for using the 85mm planar anyway if you needed that focal length.
You could consider selling one of the RF setups if you need the cash, you'll have a RF and SLR for all your 35mm stuff. That will complement each other nicely.