Going off my own experience owning iggies, beardies and blue tongues in the past (and since you have a beardie already) I'd get a blue tongue before I'd get another iggie. They are even more chill than beardies and very cute.
I've only known one iggie I liked :/ and it was at the petstore I worked at back in high school. He would come out of the cage at feeding time and hang out on the cart while I hand fed him. Got him to the point where I could get him to climb onto my arm but as soon as it was time for him to go in he got agressive. I bet with time he could have be trained a bit more but that would'eve been a lot of work.
If you have the time to work with an iggie I'd say go for it and if your heart is set on one I'm sure you'd make a good iggie mom.
Some other advice, if you can find a place that has multiple animals to choose from you'll have a better chance at picking an iggie with a good temperment. Out of ALL the iggies at that pet store (maybe 20) only the one had an out going temperment that would make it easier to work with. Kinda like choosing the right pup from a litter. Good luck and pics when you bring a new baby home
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