"...CROSS THEM OFF YOUR LIST"
Stop. Don't do it. You're going about this in the wrong direction (In my humble opinion.) If you are just looking for something to fill your tank, that's OK.
But don't you think it would be better to:
identify which type of Reptile you are attracted to;
which type you are capable of keeping/nurturing/caring for;
which type has the nature/disposition compatible with yours etc.??
Tegus are not for everyone. But they are certainly one of the best lizards to keep. They are hardy and relatively easy to maintain. They (generally) have great dispositions. (My 3 daughters 3, 5, 7, are holding our 2 juvenile tegus every day.)
AND....the people on this forum are THE MOST friendly and helpful herp enthusiasts you will ever find. What more can you ask for??
Anyway, sorry this is so long, but when you indicated you were going to cross Reds and Blues off your list just because your tank was too small, it seemed to me you were putting "the cart before the horse" as gramma used to say. I know space is a huge consideration. But don't limit your choices to that. Otherwise you may end up with an appropriately sized reptile, that you neither love nor enjoy.
To me, that sounds like a detrimental compromise.
Just my thoughts........MAP