Im thinking of staying in the conure family for the simple fact that I keep hearing conures prefer their own. I'm looking for a bird bigger than a green cheek, and a bird that wont break the bank. I am not looking to spend a grand or anything. No more than $500 but prefer alot cheaper. I've always liked black capped conures, but open to other suggestions.
I have 3 GCCs. I used to have 2, but bought one just to get it out an abused home. Of the first two, one likes and the other dislikes the third, but none of them screams in a jealous rage...
Noting that, when I had 2 GCCs, I had 2 parrotlets. The GCCs would
SCREAM IN UTTER RAGE when I went to play with the parrotlets. Rusty definitely did, but the otherwise cool and calm Scooter was VERY angry as well. How dare I try to pamper the pacific blue puffball...
I gave up the parrotlets for adoption.

It was the lesser of two evils.
From a distance, I held my newcomer Tybbi so they could all see the interaction - they all saw me and gawked, but did not scream in rage or anything approaching that.
So, my story - summed up - basically says you're right - conures prefer their own... it's definitely safe with other conures (within reason and to observe and respect each bird's likes and dislikes), but with other species the GCCs might get very obstreperous and jealous. I'd probably stick with another GCC or Pyrrhura, but Blue Crowns - thankfully - are one of the more quiet Aratingas, usually making medium-volume chirps, even at dusk and dawn... they have their LOUD moments but do seem to be more consistently quiet compared to Sun Conures... which reminds me about that conure book I want pick up... it had a good table of conure types and vocal levels pertinent to dwelling (of which Blue Crown was one of two Aratinga types to be given "OK" status for apartments; the others all said "NO"... but my blue crown doesn't get as loud as a vacuum, or as loud (or as often) as the human toddler two doors down when it cries... and all Pyrrhuras are definitely YES for apartments!

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